if you don't have genuine copy of Windows you can only use auto updates..manual will not work......MS set it up that way.......
also FYI
Many repair shops will install a handy (but illegal) "in-house" copy of Windows XP to repair their customer's computer systems and the WGA 'detects' these cloned Win XP installations as 'pirated' or illegitimate, .
Most of these computer repair places do this out of convenience because (1) it is easier than asking the customers for their own copy and (2) If they did ask the customers for their original XP Install CD; they are responsible if it gets lost or damaged at the shop.
Unless it's a coporate license you are only allowed 1 install on 1 pc per CD....and if the corporation didn't use the correct installation process & ID key per the license agreement then it would show up as pirated also