Users who are running Microsoft Windows XP or later can use Microsoft System Restore and restore their computer to an earlier date by following the below steps. This will not erase any of your data. However, if any programs were installed since that date, it is possible that the program settings may be lost.
If you are trying to recover from a virus it sometimes necessary to run these steps from Safe Mode. Windows Vista and 7 users
In the Start search box type System Restore and press enter.
Windows XP users
Click Programs, and then Accessories
Click System Tools and open System Restore
If you're unable to find System Restore and have administrator rights try opening the System restore through the run line by following the below steps.
System Restore Window
Once in the System Restore window as shown in the below example, leave the option selected on the restore option and then click the Next button to start the Restore process. You can click the option to see older restore points and go back quite far, it is not recommended to go much further than a week or so.