selected programs crash on win 2000

using win 2000 when I start microsoft outlook or sometimes another program or even link to a site on various brousers, the program loads and then immediately shuts down. the system doesn't freeze, the individual program just shuts down. If I quickly click on the menu bar that sems to hold the program open until I click on something else. then it shuts down. I tried reloading the programs and no solution was found. Any ideas out there?

 

Outlook???
This could be a virus. If you havent already, download the latest dat file and run a full scan. Sorry if I was of no help.
Good Luck