As if I haven’t had enough computer problems lately, now Windows Installer is aggravating the situation. Every time I log on a box appears informing me that Windows Installer is installing a program I have, called Photo Explosion (which I put on the computer years ago from several CDs) and, although there is a Cancel button, the box persists. Is there any way to get this to stop? A few other things–normal programs that are part of my computer’s list–will also appear. :mad:
It sounds like an installation process never got finished, or was corrupted. If you still have the source of the program, you might try uninstalling it and then reinstalling it.
Thanx 
MSI Autorepair.
There is an entry in the registry that triggers the installation of any missing MSI components during user session initialisation. This is used to automatically configure default user settings for someone who has not logged into the system previously.
If the user session is not correctly initialised or corrupt, you can end up creating new user sessions during every session startup, and triggering MSI autoconfig.
Also, if a later install has replaced a component, and the original MSI is not well written, you can get an install loop - the first program MSI detects an updated component, so it runs a repair, then the other MSI detects an outdated component, and it runs a repair.
I’ve seen both of these failure modes when I used to package applications into MSI for corporate distribution, but I cannot tell you which one is occurring.
Try the reinstall - it may help.
Are you having issues with app settings changing back to defaults? That would indicate a user session profile problem.