Index: phlib/include/ph.h
===================================================================
--- phlib/include/ph.h	(revision 3954)
+++ phlib/include/ph.h	(working copy)
@@ -2078,6 +2078,22 @@
 #define PhShowWarning(hWnd, Format, ...) PhShowMessage(hWnd, MB_OK | MB_ICONWARNING, Format, __VA_ARGS__)
 #define PhShowInformation(hWnd, Format, ...) PhShowMessage(hWnd, MB_OK | MB_ICONINFORMATION, Format, __VA_ARGS__)
 
+#define PH_USER_STATUS_QUERY_CONTINUE 0x1
+
+typedef BOOLEAN (NTAPI *PPH_USER_STATUS_MESSAGE_CALLBACK)(
+    __in HWND hWnd,
+    __in_opt PWSTR Message,
+    __in NTSTATUS Status,
+    __in_opt ULONG Win32Result,
+    __in_opt PPH_STRING SystemMessage,
+    __in ULONG Type,
+    __out_opt PULONG_PTR Result
+    );
+
+PPH_USER_STATUS_MESSAGE_CALLBACK PhSetUserStatusMessageCallback(
+    __in PPH_USER_STATUS_MESSAGE_CALLBACK Callback
+    );
+
 PHLIBAPI
 VOID PhShowStatus(
     __in HWND hWnd,
Index: phlib/support.c
===================================================================
--- phlib/support.c	(revision 3954)
+++ phlib/support.c	(working copy)
@@ -52,6 +52,8 @@
 DECLSPEC_SELECTANY WCHAR *PhSizeUnitNames[7] = { L"B", L"kB", L"MB", L"GB", L"TB", L"PB", L"EB" };
 DECLSPEC_SELECTANY ULONG PhMaxSizeUnit = MAXULONG32;
 
+static PPH_USER_STATUS_MESSAGE_CALLBACK PhUserStatusMessageCallback = NULL;
+
 /**
  * Ensures a rectangle is positioned within the 
  * specified bounds.
@@ -400,6 +402,16 @@
         return PhGetWin32Message(Win32Result);
 }
 
+PPH_USER_STATUS_MESSAGE_CALLBACK PhSetUserStatusMessageCallback(
+    __in PPH_USER_STATUS_MESSAGE_CALLBACK Callback
+    )
+{
+    return _InterlockedExchangePointer(
+        (PPVOID)&PhUserStatusMessageCallback,
+        Callback
+        );
+}
+
 /**
  * Displays an error message for a NTSTATUS value or Win32 error code.
  *
@@ -416,9 +428,30 @@
     )
 {
     PPH_STRING statusMessage;
+    PPH_USER_STATUS_MESSAGE_CALLBACK callback;
 
     statusMessage = PhpGetStatusMessage(Status, Win32Result);
+    callback = PhUserStatusMessageCallback;
 
+    if (callback)
+    {
+        if (callback(
+            hWnd,
+            Message,
+            Status,
+            Win32Result,
+            statusMessage,
+            0,
+            NULL
+            ))
+        {
+            if (statusMessage)
+                PhDereferenceObject(statusMessage);
+
+            return;
+        }
+    }
+
     if (!statusMessage)
     {
         if (Message)
@@ -465,10 +498,33 @@
     )
 {
     PPH_STRING statusMessage;
+    PPH_USER_STATUS_MESSAGE_CALLBACK callback;
     INT result;
 
     statusMessage = PhpGetStatusMessage(Status, Win32Result);
+    callback = PhUserStatusMessageCallback;
 
+    if (callback)
+    {
+        ULONG_PTR callbackResult = 0;
+
+        if (callback(
+            hWnd,
+            Message,
+            Status,
+            Win32Result,
+            statusMessage,
+            PH_USER_STATUS_QUERY_CONTINUE,
+            &callbackResult
+            ))
+        {
+            if (statusMessage)
+                PhDereferenceObject(statusMessage);
+
+            return !!callbackResult;
+        }
+    }
+
     if (!statusMessage)
     {
         if (Message)
Index: ProcessHacker/actions.c
===================================================================
--- ProcessHacker/actions.c	(revision 3954)
+++ ProcessHacker/actions.c	(working copy)
@@ -1046,7 +1046,7 @@
 
     if (!DebuggerCommand)
     {
-        PhShowError(hWnd, L"Unable to locate the debugger.");
+        PhShowError(hWnd, L"Unable to locate the debugger. Make sure you have installed and configured a debugger correctly.");
         return FALSE;
     }
 
Index: ProcessHacker/appsup.c
===================================================================
--- ProcessHacker/appsup.c	(revision 3954)
+++ ProcessHacker/appsup.c	(working copy)
@@ -463,6 +463,147 @@
     }
 }
 
+PWSTR PhpGetFriendlyErrorMessage(
+    __in NTSTATUS Status,
+    __in_opt ULONG Win32Result
+    )
+{
+    if (!Win32Result)
+        Win32Result = PhNtStatusToDosError(Status);
+
+    switch (Win32Result)
+    {
+    case ERROR_ACCESS_DENIED:
+        if (PhElevated)
+            return L"Permission was denied.";
+        else
+            return L"Permission was denied. Run Process Hacker with administrative privileges and try again.";
+    }
+
+    switch (Status)
+    {
+    case STATUS_INVALID_CID:
+        return L"The process or thread does not exist. It may have terminated already.";
+    case STATUS_HANDLE_NOT_CLOSABLE:
+        if (PhKphHandle)
+            return L"The handle is protected. Remove the Protected attribute of the handle and try again.";
+        else
+            return L"The handle is protected.";
+    }
+
+    return NULL;
+}
+
+BOOLEAN PhUiUserStatusMessageCallback(
+    __in HWND hWnd,
+    __in_opt PWSTR Message,
+    __in NTSTATUS Status,
+    __in_opt ULONG Win32Result,
+    __in_opt PPH_STRING SystemMessage,
+    __in ULONG Type,
+    __out_opt PULONG_PTR Result
+    )
+{
+    BOOLEAN result = TRUE;
+    PH_AUTO_POOL autoPool;
+    TASKDIALOGCONFIG config = { sizeof(config) };
+    TASKDIALOG_BUTTON buttons[1];
+    INT button;
+
+    if (!PhGetIntegerSetting(L"EnableFriendly"))
+        return FALSE;
+    if (!TaskDialogIndirect_I)
+        return FALSE;
+
+    PhInitializeAutoPool(&autoPool);
+
+    config.hwndParent = hWnd;
+    config.hInstance = PhInstanceHandle;
+    config.pszWindowTitle = L"Process Hacker";
+    config.pszMainIcon = TD_ERROR_ICON;
+
+    if (Message)
+    {
+        config.pszMainInstruction = PhaConcatStrings2(Message, L".")->Buffer;
+    }
+    else
+    {
+        config.pszMainInstruction = L"Unable to perform the operation.";
+    }
+
+    config.pszCollapsedControlText = L"Show details";
+    config.pszExpandedControlText = L"Hide details";
+
+    config.pszContent = PhpGetFriendlyErrorMessage(Status, Win32Result);
+
+    if (config.pszContent)
+    {
+        // We put the friendly message in the content area, so put the details 
+        // in the expanded information area.
+
+        if (Win32Result)
+            config.pszExpandedInformation = PhaFormatString(L"Win32 error %u: %s", Win32Result, PhGetStringOrDefault(SystemMessage, L"Unknown"))->Buffer;
+        else
+            config.pszExpandedInformation = PhaFormatString(L"Status 0x%x: %s", Status, PhGetStringOrDefault(SystemMessage, L"Unknown"))->Buffer;
+    }
+    else
+    {
+        // We don't have a friendly message, so put the deails in the content area.
+
+        config.pszContent = PhGetStringOrDefault(SystemMessage, L"An unknown error occurred.");
+
+        if (Win32Result)
+            config.pszExpandedInformation = PhaFormatString(L"Win32 error %u.", Win32Result)->Buffer;
+        else
+            config.pszExpandedInformation = PhaFormatString(L"Status 0x%x.", Status)->Buffer;
+    }
+
+    if (Type == 0)
+    {
+        config.dwCommonButtons = TDCBF_CLOSE_BUTTON;
+        config.nDefaultButton = TDCBF_CLOSE_BUTTON;
+
+        if (TaskDialogIndirect_I(
+            &config,
+            NULL,
+            NULL,
+            NULL
+            ) != S_OK)
+        {
+            result = FALSE;
+        }
+    }
+    else if (Type == PH_USER_STATUS_QUERY_CONTINUE)
+    {
+        config.dwCommonButtons = TDCBF_CANCEL_BUTTON;
+
+        buttons[0].nButtonID = IDYES;
+        buttons[0].pszButtonText = L"Continue";
+
+        config.cButtons = 1;
+        config.pButtons = buttons;
+        config.nDefaultButton = IDYES;
+
+        if (TaskDialogIndirect_I(
+            &config,
+            &button,
+            NULL,
+            NULL
+            ) == S_OK)
+        {
+            *Result = button == IDYES;
+        }
+        else
+        {
+            result = FALSE;
+        }
+    }
+
+    PhDeleteAutoPool(&autoPool);
+
+    return result;
+}
+
 VOID PhSearchOnlineString(
     __in HWND hWnd,
     __in PWSTR String
Index: ProcessHacker/include/phapp.h
===================================================================
--- ProcessHacker/include/phapp.h	(revision 3954)
+++ ProcessHacker/include/phapp.h	(working copy)
@@ -179,6 +179,16 @@
     __in mxml_node_t *node
     );
 
+BOOLEAN PhUiUserStatusMessageCallback(
+    __in HWND hWnd,
+    __in_opt PWSTR Message,
+    __in NTSTATUS Status,
+    __in_opt ULONG Win32Result,
+    __in_opt PPH_STRING SystemMessage,
+    __in ULONG Type,
+    __out_opt PULONG_PTR Result
+    );
+
 PHAPPAPI
 VOID PhSearchOnlineString(
     __in HWND hWnd,
Index: ProcessHacker/mainwnd.c
===================================================================
--- ProcessHacker/mainwnd.c	(revision 3954)
+++ ProcessHacker/mainwnd.c	(working copy)
@@ -403,6 +403,7 @@
     // Initialize child controls.
     PhMainWndOnCreate();
 
+    PhSetUserStatusMessageCallback(PhUiUserStatusMessageCallback);
     PhpInitialLoadSettings();
     PhLogInitialization();
     PhQueueItemGlobalWorkQueue(PhpDelayedLoadFunction, NULL);
Index: ProcessHacker/memedit.c
===================================================================
--- ProcessHacker/memedit.c	(revision 3954)
+++ ProcessHacker/memedit.c	(working copy)
@@ -402,7 +402,7 @@
                         {
                             if (offset >= context->RegionSize)
                             {
-                                PhShowError(hwndDlg, L"The offset is too large.");
+                                PhShowError(hwndDlg, L"The offset is too large. Make sure it is less than the size of the region.");
                                 continue;
                             }
 
Index: ProcessHacker/settings.c
===================================================================
--- ProcessHacker/settings.c	(revision 3954)
+++ ProcessHacker/settings.c	(working copy)
@@ -74,6 +74,7 @@
     PhpAddStringSetting(L"DbgHelpSearchPath", L"");
     PhpAddIntegerSetting(L"DbgHelpUndecorate", L"1");
     PhpAddIntegerSetting(L"ElevationLevel", L"1"); // PromptElevateAction
+    PhpAddIntegerSetting(L"EnableFriendly", L"0");
     PhpAddIntegerSetting(L"EnableKph", L"1");
     PhpAddIntegerSetting(L"EnableNetworkResolve", L"1");
     PhpAddIntegerSetting(L"EnablePlugins", L"0");