The biggest problem with Windows XP was that it was Microsoft's first operating system to feature Product Activation
, the licensing system that tied product keys to hardware fingerprints. Gone were the days of buying one copy of the software and installing it on multiple machines. With Windows XP, every system would need its own copy.
I never had that problem. Perhaps it was because I bought an OEM installation disk [I don't know] but I had XP Pro installed on 4 different machines using the same installation disk, and never had a single problem with activation. I must have done around a hundred clean installs too, playing around with slipstreaming the service packs.
I don't think there is any comparison between XP, and Windows 8. Unless Windows 8 comes out with a service pack comparable to XP's legendary SP2 [which will NEVER happen] that allows you to change the GUI from Metro to a GUI that is actually productivity friendly, Windows 8 will never receive the same popularity that XP SP2 did. Let's face it, Windows 8 will always
suck BIG TIME! Unless, of course, you have it on a tablet which is what Windows 8 was designed for. They never should have started putting it on desktops. Biggest blunder Microsoft has ever made IMHO.