Ran through the Micro$oft Windows XP Service Pack 2, found it has added lots of security enhancement but came with one flaw: explorer.exe. I can't seem to delete anything. Everytime I tried to delete something, it will generate an error message. Got tired of that, I uninstall the service pack and found everything runs without problem.

Perhaps will test it out with another machine to see. Not sure what is wrong with the updates. Go another friend downloaded it last night faces a different issue. Will try to sort out whether it's the customized company software problem other caused by other anomalies.