We have numerous 2003 servers which are having this problem. SVCHOST.EXE uses up 100% of CPU and causes all critical applications to fail. We've tried everything mentioned in this article - no success"
So if you are still running Server 2003 and Windows XP and you see SVCHOST.exe chewing up the CPU, yes, it's a known issue right now and yes Microsoft it working on fixing it. It's on their end not yours.
Hang tight, I'll see if I can find out an ETA of when they plan to fix it. Again.