Does your computer crash on any other apps? Whats the error message your getting? (click on details)
1. See whats going on in the event viewer. Click on Control Panel > Administrative Tools > Event Viewer and check out the applications and System logs for problems.
2. Go into Add / Remove programs from the control panel and uninstall any pos application you don't truley need including any torrent software. (we'll reinstall them later)
3. Clean temp files, IE history, cookies, ect.
4. Install > Update > Run spyware software, either Spysweeper by Webroot or Adaware by Lavasoft, their both free.
5. Reinstall the latest torrent sofware.