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Windows 7 64bit.

I am using ProcessExplorer from Sysinternals, and it says, that the offending call is


however, the call stack towards the entry is always different, so it's hard for me to track the problem. Maybe it's a mal-programed trojan, causing exceptions in Explorer.exe, but that is only a wild speculation.

Explorer.exe is then consuming 25% (a core on a dual core). Killing the process makes the task bar go away, respawning from task manager, and half a minute later it's again eating all CPU cycles.

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I suspect a DLL that isn't releasing resources for some reason. What plugins do you have installed? – user3914 Sep 16 '12 at 18:29
It's most likely a shell extension. You can use autoruns to identify all shell extensions. – David Schwartz Sep 16 '12 at 21:39

Use SysInternal's sister program, Process Monitor, to see what it's actually doing.

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