Thanks,g3guy, for your kind persistance. What you mentioned is correct after all ! But it does not do the cleaning job automatically. After typing in the "Run" window, I have to go through the procedure again. The problem is I do not always remember to do it ! It is for this reason that I am looking for an automatic procedure. Apparently from the feed-back I got sofar , there is no automatic solution! I would love to tweak WinXP so that after I type in some command in "Run" , this command will be cleared automatically after the command execution. The key issue here is the "automatic clearance" .
Again, I appreciate your kindness ,g3guy;