You are on a seriously wrong tram here, Stephen. There is absolutely no reason to believe that Windows XP SP2 has any compatibility problems with any current processor (or any even vaguely recent one either). That's none, repeat none.
There is, however, very good evidece that the XP SP2 upgrade can trash a system if the system is infected with spyware before the upgrade takes place. This is well-known around the traps, and we have seen it for ourselves from time to time also.
But what on earth was your friend doing installing SP2 now? It's been out for a very long time, and been generally accepted as a good and safe thing to install for almost that long. How did your friend manage to justify not installing it months and months ago? Unless there was a pretty good reason, sounds to me like a simple case of neglecting to maintain the system properly in that respect, which immediately makes me wonder what other things were not maintained properly, and distrust any "conclusion" drawn from that system.
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