Why won't Windows 7 work on my HP Pavilion a6720y desktop PC? I have searched and searched for an answer to this question. Thus far I have not come up with anything. The computer, since I upgraded to Windows 7 from Vista, seems to have error after error that was not present before the upgrade. They are as follows: Blue screen of death (multiple times)... Not sure when this exactly occurs. Usually on shut down, or when the computer enters into sleep mode. Cannot connect to wireless (connects then goes to limited access after about half an hour)... This is quite annoying. I've tried just about everything with my router. The strangest thing is that it worked with Vista. With Windows 7, it says that the connection is good. But no dice. Will not properly shut down... Goes into the shut down sequence but never completes. Usually blue screens at this point. Please, if you can help it would be greatly appreciated. I am running the 64 bit Windows 7 ultimate. Thank you in advance for any help. I am lost without my computer.