The Inspiron 1520 was a mid Windows Vista system. Its BIOS (even at A09) has a SLIC version of 2.0 and will only activate Windows Vista using OEM SLP. Dell Windows 7 OEM will not activate as it requires a SLIC of version 2.1.
I have a Dell Inspiron 1520 which orginally came with Vista I have Dell Windows 7 CD .. Will it self activate ?  Will be doing a full reinstall including a format to remove any old remnants or personal files. Not sure if this BIOS is SLP Locked or not. Currently Bios A02 but I can get the A09 if I need it. Thanks
Inspiron 1520 & Windows 7