I did a few searches and didnt come up with anything useable, so here goes...I recently updated to XP SP3 and wasnt satisfied with the changes. Next, i used System Restore to revert back to the point before installing SP3. Now, everytime I launch an spplication Windows starts the Microsoft Installer for about 1 -2 seconds and then quits. Its literally an instant! However, I dont know why this has happened and I even tried to System Restore to an earlier point and the same app execute error still exists. I suspect maybe a resgistry setting has been changed? Anyones thoughts are welcome please :]