How can I clear the Run history?
1. Start the registry editor (regedit.exe) (start→ Run → regedit ↓
2. Move to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\RunMRU
3. Select the entry you wish to remove, e.g. h
4. Press the Del key (or select Edit – Delete) and click Yes to the confirmation
5. Double click the MRUList value and remove the letter you just deleted. Click OK to save the change
6. Close the registry editor