100 % CPU Time

My win2k Server hangs while using IE 6.0 when i checked with Task MAnager am seeing 100 % Cpu time. Ie 6.0 is taking most of the CPU time. i killed the process . it again starts the same problem when i use IE. on some server i reinstalled the IE butproblem retains.

Moreover its not only with IE sometimes it happens on other applications as well. how do i resolve when an applications takes up 100% cpu time.