When you try to access the “Previous Versions” tab that is used with Shadow Copy, it is missing.
To bring it back, follow these steps.
- Go to “Start” > “All Programs“ > “Accessories“.
- Right-click “Command Prompt“, then select “Run As Administrator“.
- Type “regsvr32 twext.dll” and press “Enter“. A message should appear that says registration was successful.
Now give it a try and see if the Previous Versions tab has returned.