How to Reduce Shadow Copy on Windows Vista Picture 3
Select Command Prompt (make sure you right click on Command Prompt first, and select Run as administrator).
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Type in vssadmin list shadowstorage.
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Press Enter/Return. Command Prompt will show the allocated space towards Shadow Copy. This can be reduced to allow more free hard drive space.
Method 2 of 2:
Reducing Hard Disk Space Allocated for Shadow Copy
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Exit Command Prompt and backtrack to Step 3 in Reviewing Shadow Copy. Open Command Prompt, again selecting the Run as administrator option when right-clicking.
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Type in vssadmin resize shadowstorage /On=C: /For=C: /Maxsize=[here add the maximum space you will allow for Shadow Sorage, e.g. 3GB].
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Press Enter/Return. The results will be displayed in Command Prompt.
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Click Start>Computer and once again review the available disk space for Local Disk (C:).