CF
what I would do is a clean install. No surprise there. I would get acronis and do an immediate back up of the system. then you can add, add, add, and if something breaks it you know what it is and can be back in original state in 30 minutes.
the first event id error was an MSI installer which may have been the net framework. I dont know but IM sure you are tired of it crashing on you
let us know if you need something
ken