Logfile of HijackThis v1.99.1
Scan saved at 2:18:26 PM, on 1/15/2006
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v6.00 SP2 (6.00.2900.2180)
check eventvwr, also see if you can get an error message to pop up. Wait until you have some time and try and get the lock up. When it happens, let it sit and see if you get an error, or if anything comes up see if there is a details button.