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Which shouldn't be a problem if it's a legit version of Windows.

A few weeks ago I bought some new RAM and had all kinds of neat problems when I installed it. That RAM caused me to lose one video card (replacement not available, so I removed the other (SLI setup) and replaced it with a newer model), one mainboard, one of the old sticks of memory and the hard drive.

I used an old hard drive that I had repaired after it got corrupted previously, and it still had XP installed on it. After booting it up with all the new pieces/parts, Windows complained that the hardware significantly changed since it was registered (three sticks of RAM, a mainboard, new video card, etc) and I'd have to reactivate it.

The activation took place over the net with no hassle. I was expecting to have to phone it in after all that stuff changed (basically a hard drive, one stick of RAM, and the CPU were the only common parts), but I didn't. Activation isn't nearly as painful as people make it out to be (as long as you do have a legit copy).