We too run Windows Server 2003 with sp2 and one of our servers has an update named: “Hotfix for Windows XP (KB954550-v5)” in the Add or Remove Programs. It also states that “This update cannot be removed”. We noticed abnormal spiking of our CPU by the w3wp.exe (IIS) and have reason to believe it may be due to this KB954550-v5. The reason we suspect it is because only the machine with the KB954550-v5 hotfix spikes its CPU at 50 when browsing to any aspx/asp.net page in our site. The symptoms correspond with the date this hotfix was installed. We do not know how it got there, although it is reasonable that it was installed with .Net 3.0 or 3.5. However, uninstalling .Net 3/3.5 does NOT remove this hotfix. It is obviously an unusual hotfix since it states it is for Windows XP while on a Windows Server 2003 machine.

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Hotfix for Windows XP (KB954550-v5) might be causing w3wp.exe to spike CPU on Windows Server 2003

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