The Windows registry records when the system was last closed down in the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows
under the ShutdownTime value. The shutdown value is stored using a binary value; to decode it to a readable form.
Windows Shutdown Time
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Discussion on the R-Wipe & Clean and R-Crypto software
Discussion on the R-Wipe & Clean and R-Crypto software