You can use either CPU-Z or Speccy to take the guess work out for you.
Most computer vendors have their own methods of creating recovery media since they have gone green and don't include any with the PC. Get us your specs and we should be able to point you in the direction you need.
Go to Programs, Accessories, System Tools then select Backup. You can also get the License key serial number that currently installed on your computer by downloading winkey finder for windows 7. After you get the license, use it on the time you need to reformat again your computer. Or do it with backup software. http://backup.comodo.com/