On my XP professional SP3 to bring up the task manager with ctrl-alt-del seems to be the completely standard action.
BTW do you know that as of 13 July 2010 there are no more security updates for XP SP2 so you are becoming increasingly vulnerable. You really should be on SP3, for which you will receive full support until 2012 (originally, but that promise has now disappeared from MS published life cycles, which is a bit ominous).