It is SP1 that fixed the hard drive size issue. In this case, the best thing to do is to obtain a copy of XP with SP1, or create a new windows cd with the necessary service packs as mentioned.Originally Posted by Whacker
As to x64, it can access more memory (above 3.2 GB), and handle larger hard drive partitions (upwards of 4 terrabytes if I'm not mistaken). Performance wise you may not notice much of a difference with 32 bit apps, but I think there are differences for apps that are optimized for 64 bit.
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