I get this, there seems to be no reason why it happens, but every now and again Windows 7 appears to freeze, even the taskbar. I can't switch applications, or do anything but move the mouse cursor, then it comes back to life after 30 seconds or so.
When it happens I wonder if I have a bad sector or dying HDD but there is never anything in the event logs, and no horrible sounds from my HDD.
Well apparently this is the fix:
http://support.microsoft.com/kb/2265716/en-us
Going to try it and see if it happens again...
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This happened to me last week.. I assumed that this was probably some updates going on in the background as it has not happened since restarting the PC..
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I don't want to belong to any club that will accept me as a member