My friend has a Dell 1545 with bios A14 and Vista on it. Dell offered him a Windows 7 upgrade a while back but he never did it. He wants 7 now. Is there a way to load it on there with a Dell Windows 7 OEM disc? I'm not sure if it's SLIC 2.1 or not. Also I'd need instruction on how to do that. If not, then I also have a windows 7 Pro. OEM key from an old HP that is completely dead and always will be. Could I use the Dell OEM disc on the 1545 and then use that HP key as the serial? Would that just be easier? I'd like to know before I wipe out all his stuff if it'll work either way. Thanks for any help.