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Microsoft is still attempting to fix a bug in Windows XP that has caused SVCHOST to push the CPU of a PC to 100 percent usage in clean installs of Windows XP SP3



From Neowin:
Over a month ago, we reported that many users defiant or unable to upgrade from Windows XP were experiencing a bug in SVCHOST that causes the CPU of a PC to go up to 100 percent usage. We contacted Microsoft for comment but they did not send back a response.

Although Microsoft is trying to come up with a solution before the company officially cuts off support for Windows XP in less than five months, this much we do know. InfoWorld reports that the problem was supposed to be fixed with this month's "Patch Tuesday" releases. However, it appears that patch was ineffective against the SVCHOST bug.
  Microsoft still trying to fix SVCHOST bug in Windows XP