Clean Up old Windows System Restore Points

Click the Start-Button and type: CleanMgr, Press Enter.

Choose your main Hard-Drive (the one where your Restore Points are stored – usually C:)
Let Clean Manager Search through your system for deletable files.

When Clean Manager is done Calculating, click on the More Options tab

Click The Clean Up button found under “System Restore and Shadow Copies”, to remove all but the most recent restore point.