Delete Run History in XP

Steps

1.Go Start → Run.
2.In the text field, type regedit and hit enter to open the Registry Editor.
Navigate to HKEY_CURRENT_USER → Software → Microsoft → Windows → CurrentVersion → Explorer → RunMRU.
3.On the right panel, you will find the programs that you have used when accessing the RUN command. They will be listed as a, b, c, etc.

4.Right-click on the program you want to delete and click Delete.
5.Click Yes in the next dialog box to confirm. You will then need to restart your computer for the changes to take effect.

Tip:
If you want your Run history to be automatically deleted every time you start your computer, then go to the following location in the Registry Editor: HKEY_CURRENT_USER → Software → Microsoft → Windows → CurrentVersion → Policies → Explorer. There on the right hand side panel look for ClearRecentDocsOnExit, double click on it and type in its value as 1 and make sure Hexadecimal is selected. Then just click on OK and close the Registry Editor.

Alert:
Don't do anything without know wat u doing !