Dont forget you need your "product key".You should also consider "exporting" your email accounts & address book.Also copy internet favourites,inbox, Also take note of your dial up numbers & settings. Also take note of your hardware as you have to reinstall sound card,modem,usb card & printer software plus extras (scanners ect), abode acrobat,anti virus,office (dont forget you may need a product key)...........................If you kept all your CDs & bits & pieces,then everything should be OK. Incidently its possible to just delete the Windows & programme files folder using DOS "deltree" (copy from windows/command to c: before deleting windows)( & reinstall without reformat.Also make suri install CD is OK. You can try copying over your existing windows & this has worked for me once.