I've followed the guides here and tried many times to get this to work over the last 2 months, but somewhere along the way I screw up everytime. I'm trying to activate vista business on my acer laptop and make an oem dvd. I have slic 2.1 bios. Everytime I try to activate vista it tells me that the key is invalid for activation. My laptop originally came with windows 7 home premium, but I hate it and need to go back to vista. I own a copy of vista, but like a fool I paid for the ultimate upgrade *facepalm* and it runs very slow on this laptop. It also causes it to get very hot. The business version is the only one that functions properly on my laptop. Can someone help me activate vista business on my laptop?