Assume you are trying to do it from inside windows without Full admin privileges
Boot into the Advanced Startup menu.
Open the Charms bar by moving your mouse into the bottom-right corner of your screen, or by swiping from the right edge. Click “Settings” and then click “Power”. Hold the Shift key and click on the “Restart” option. If you cannot access Windows, insert your installation disc and select “Repair your computer”. The Advanced Startup menu will open.
Select Troubleshoot. This will open a menu of tools that you can use to repair your computer. Click “Advanced Options”, and then select “System Restore”. You may be asked to log in, and then System Restore will open.
Windows will automatically select the most recent restore point in which something was installed or changed. If you want to select a different point, click the bottom option and click Next. You will be provided a list of available points with a short description of what occurred to create the restore point.
When you select your point, you will be given one more chance to ensure that you want to proceed. Review the point you selected and click the “Finish” button and then “Yes” to start the restore.
Your system will reboot and the restore process will begin. Once the restore is finished, Windows will load and you will be shown a message confirming that the restore was successful.