to be honest Seal i have not played with XP SP3 yet... my personal is Vista...
but i did read this a couple of days ago ( just an FYI)
Reports are all over about problems with some users installing Windows XP SP3; their systems go into a continuous reboot cycle.
Now Microsoft has provided an explanation, and it's an interesting one. The problem occurs on AMD-based systems where Windows was build from an OEM image captured on an Intel-based system. Perhaps it never mattered before, but in such cases, and depending on a particular registry key, an Intel-specific driver (Intelppm.sys) is loaded.
Microsoft Knowledge Base article KB88372 explains this some more and gives instructions for what to do if you are experiencing the problem. There is even more on the subject in this forum post on microsoft.com. The Reason Behind The XP SP3 Continuous Reboot Bug
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