Clear Recent Commands From the Run Dialog

How to clear History from command RUN, let me assist you

1. First open Windows + R to Run Prompt, here place that you want to erase.

 

2. Type Regedit  and Enter
3. see the picture, and delete it what you do not want to see, don't forget to change MRUList too.

Completely Clear Recent Run Dialog Entries  

Right-click on the taskbar and choose Properties, then choose Start Menu. 

Select the “Classic Start menu” option, and choose the Customize button. (Don’t worry, we’ll cancel out of the dialogs so you can keep the XP menu style)
Now just click the Clear button to remove all of the recent documents and applications from the start menu

Once you’ve done that, hit Cancel and then Cancel again to make sure you don’t switch to the Classic Start menu.