Firstly close any open programmes.

Click on Start, then click on Help and Support.

Under where it says Pick a task, click Undo changes to your computer with System Restore.

Select Restore my computer to an earlier time and click on Next.

A calender will appear (only dates in bold are available) . Click on a date you wish to restore your computer to, and then click on next.

A confirmation screen appears. Click on next.

Your computer will close down and reboot to a similar screen showing if the system restore has been successfull, or un-successful.