I don't use a P4 HT but isn't it supposed to be making multi-tasking faster? :dunno:
Anywayz, a service pack 1 isn't enough. Get the service pack 2. With service pack 1 and w/o the right patches you will still be in danger when connected to the net. If you still wanna make do with service pack 1, make sure you get the patches for the W32.Blaster worm and Sasser worm before going online.
By the way, if i'm not wrong you can still order the service pack 2 CD from Microsoft. It's free. But order it fast. I think it's gonna end soon. I personally have the Windows XP Security CD (Feburary 2004) and the Windows XP Service Pack 2. It really makes new installations and reformatting a breeze. Imagine having to download all the patchs from windowsupdate!