Clear Unwanted Entries
Clear Unwanted Entries from the Start Menu's Run Command
Whenever you use the Start Menu's Run command to launch a program, that program is added to a history. Since this is a possible cause to an irritating problem, a solution is provided here for clearing this history:
Run the Registry Editor (REGEDIT.EXE).
Open HKEY_CURRENT_USER\ Software\ Microsoft\ Windows\ CurrentVersion\ Explorer\ RunMRU\.
Delete all of the values in this key (everything in the right pane, except for (Default)).
Close the Registry Editor when finished. You'll probably have to refresh the
Desktop or restart Windows for this change to take effect