Heads up, owners of 64bit PCs that going to upgrade to WinXPx64. If you’re contemplating upgrading your machine to Windows x64, using Microsoft’s tempting “Technology Advancement Program”, which is, basically, a $12 upgrade from XP to x64, you could end up violating your PC’s warranty.

In fact, when you agree on Microsoft’s conditions to get the upgrade, you agree that your PC’s warranty will be voided. In a sense, this is nothing new: PC warranties are often voided in theory if you make any changes to your system. (A show of hands, please: How many of you have never made a single change to your computer?) And according to the eWeek story, different vendors have varying policies on whether they object to the x64 upgrade or not. But it certainly looks as if it’s worth checking in with your manufacturer before you give Microsoft your twelve bucks.

Anyway, clone 64bit PC owners like me, will not be affected, because we are the one warranting the system.

[Source]