If you have butter fingers like me, and over time end up with a lot of old commands with typos in your Windows run box that get annoying – deleting them is a simple. All you need to do it remove the following registry key.
Now every time one plays with regedit, it can be dangerous – you can also save this commend as a .cmd file, and then run it with admin privileges – essentially does the same thing.
reg delete "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RunMRU" /f
You can also download the same thing from here.