windows 2000 pro started to hang then reboots continuously after downloading a trial upgrade of my billing software and hard disk space is < 500 MB, upgraded to windows xp pro did not helped, install a brand new 160 GB hard disk as master and old disk as slave with the full retail winxp Pro SP2 as only o.s. helped at first but after restoring all printer and norton internet security, paperport 9.0, problem slowly cameup again !!!! Now it just reboots after abt. 2-3 minutes of usage.
Please advice what to do, I feel like throwing it down from the twin tower !!!!