rajputwarrior @ Neowin Forums has written a nice guide on how to optimize Windows XP
for Dual Core.
This article is for both Intel and AMD’s Dual Core based CPU’s
Read Complete Article Here : Neowin Forums
For your sceptics out there, check out this review of a sager laptop with the fix applied. Not only does it fix the games in this review, but a lot of the newer ones (such as HL2 or GRAW and the upcoming unreal tournament 3) this will give you a nice boost in performance.
SagerLaptop Review : NoteBookReview