I also have installed SP2 and its running fine!!!!i have no problems with the performence or others...........!!I only had the problem that some programms did not function after installing sp2!!!so i recommend that you format your Harddrive and install the hole Windows XP with integrated SP2 !!!!That was much better than the first try and i am satisfied with the new sp2 !!!The security level is much higher than before so i recommend installing sp2 on your system !!!!i am looking forward to sp3 *gg*!!!mfg 5ZylinderPS.: "Never change a running system"