Open DXDiag from the Windows Run Box

Q: What is the Windows Run box?

The Windows Run box is a built-in dialog that lets you launch programs, open files, and access Windows settings by typing a command. You open it by pressing Windows + R. It accepts executable names (like dxdiag), file paths, website URLs, and system commands (like msconfig or devmgmt.msc). The Run box has existed in every version of Windows since Windows 3.1 and is the fastest way to open many system tools.

Q: Why is the Run box the fastest way to open DXDiag?

The Run box executes commands instantly without searching the file system or loading an index. When you type dxdiag in the Run box, Windows immediately looks up dxdiag.exe in the System32 folder and runs it. Search-based methods take a moment to query the search index before showing results. For system utilities in System32, the Run box is always faster than search.

Q: Can I use the Run box history to reopen DXDiag?

Yes. Windows remembers commands you have previously typed in the Run box. After you have opened DXDiag once via Windows + R, the next time you open the Run box you can press the down arrow key or click the dropdown arrow to see your history. Select dxdiag from the list and press Enter without retyping the command.

Q: What if the Windows Run box does not open?

If pressing Windows + R does not open the Run box, the keyboard shortcut may be disabled by a group policy or a conflicting application. Try right-clicking the Start button and selecting Run from the menu. If that option is missing, you can open the Run dialog through Task Manager: press Ctrl + Shift + Esc, click File, and select Run new task. Type dxdiag and press Enter.

Press Windows + R to open the Run box. Type dxdiag and press Enter. DXDiag opens immediately. This is the fastest and most reliable method to open DXDiag on any Windows PC.

How to Use the Run Box to Open DXDiag

Hold the Windows key and press R. The Run dialog opens.
Type dxdiag in the Open field.
Press Enter or click OK.

Exact command to type:

dxdiag

The DirectX Diagnostic Tool opens within 1 to 3 seconds. If a User Account Control prompt appears asking for permission, click Yes to proceed.

The Run Box Command History

Windows saves all commands you have previously typed in the Run box. The next time you open the Run box with Windows + R, you can press the down arrow key on your keyboard to scroll through previous commands. Select dxdiag from the list and press Enter — no retyping required.

To clear your Run box history, open the Registry Editor (regedit), navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RunMRU, and delete the entries you want to remove.

Other Useful Run Box Commands for PC Diagnostics

Command	Opens
`dxdiag`	DirectX Diagnostic Tool
`msinfo32`	System Information (full hardware inventory)
`devmgmt.msc`	Device Manager
`perfmon`	Performance Monitor
`eventvwr`	Event Viewer (Windows error logs)
`mrt`	Malicious Software Removal Tool

Frequently Asked Questions

What is the Windows Run box?+

Why is the Run box the fastest way to open DXDiag?+

Can I use the Run box history to reopen DXDiag?+

What if the Windows Run box does not open?+

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