I purchased a used Toshiba laptop Qosimo G55-Q801. It originally had windows vista on it and some one put windows 7 ultimate. The screen seems too dark. I haven't found a way to brighten it up. Could it possible that the right drivers are not installed? How would I find out and is there a way to correct this. I have tried all my screen settings and nothing helps. Second question, it has been loaded with 64 bit. I have some programs that will not run in 64 bit. The original COE # for Vista is worn off. If I install a code finder and find the COE for the Windows 7 and I have a copy of Windows 7 that is 32 bit but no COE # can I install it and use the other COE#?