To restore your computer to a previous date in time you will just simply clcik on the Start menu, then go to programs, then accessories, then to system tools, and click on system restore. Once you do that it will pop up a window with a mini calender in it with dates in bold blue that you can choose to restore your computer from, choose the date you want then restore and then restart your computer for the changes to take effect.
To restore your computer to a previous date, you will need to go to start, then to all programs,accessories, system tools and system restore. This will work on most computers. Once there follow the directions and choose the date you want to restore to.