Winlogon.exe at 50% or 100% CPU (Fix)

There are apparently a variety of things that can cause the winlogon.exe process on Windows PCs to consume all available CPU, but I’ve found few references to this cause – corruption in Offline Files, even when Offline Files is disabled on the PC, on the server and on the domain (via Group Policy). Depending on the age of the PC, this will consume either 50% of the CPU (on newer dual-core systems) or 100% of the CPU (on older systems). This is the only non-malware winlogon.exe problem that I recall personally encountering.

Update: The original title & article indicated that this applied to Windows PCs on domains only, but Offline Files is available to non-domain PCs as well as long as Fast User Switching is not turned on.

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