how can i delete what I've written in run without restarting the computer?
3 Answers
CCleaner can do it.
Select only the "Run (in Start Menu)" option, and it should do what you want.
Use registry editor (regedit).
Go to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RunMRU
and delete all values under that key.
You can clear all recent Run dialog entries without manually modifying the registry or installing additional programs.
See http://www.howtogeek.com/howto/windows/clear-recent-commands-from-the-run-dialog-in-windows-xp/ for walkthrough /w screenshots.