How to restore Dell Inspiron 1525 to factory settings? (Using Windows 7)? -

Ok heres the deal. I downloaded windows 7 beta version and installed it on INSTEAD of vista. i didn t like 7 because i couldn t run some programs that were only designed for xp/vista. and now i want to restore it too factory settings. I know how i would do it before by pressing F8 when it boots up, but now there is no option to restore pc to factory settings so i dont know how to do it. PLEASE HELP!!

If you have the OS CD that came with, thats how. Otherwise, you are gonna have to call who you bought it from to get a disk.