Hello ! I would like to share my experiences about my sytem upgrading. I had Intel Core 2 Duo CPU with ASUS P5B Deluxe MB + 4 GB Ram on my system. Of course BIOS was modded to slic 2.1 to activate Win 7 64 bit, Home Premium. Had Win 7-HP installed and activated on this system. I've decided to make some upgrade. The new components are : AMD Phenom X4 960T, ASUS M5A78L MB + 8 GB RAM. Old components out...new in...change BIOS to modded one... switching on the machine..Unfortunately i forgot to change boot sequence to boot from a CD, and previously installed Win 7 booted up. After a some automatic driver refreshing, Win started up, and it is ACTIVATED, and running smoothly ! What a time saving !!! No need to format or reinstall even..lol.