I am not sure about SONY VAIO but some laptops, you need to press F1 to go into BIOS (some F2 or DEL.. see this http://michaelstevenstech.com/bios_manufacturer.htm
). I am saying this because I do not think we are talking of the same thing here.
Assuming you are indeed looking at your BIOS setup screen (this can be accessed before Windows loads/boots up. This is also where you see your BIOS level, BOOT devices and boot sequence, model of computer, etc.) and screen is fuzzy then IT IS NOT CAUSED by VISTA (simply because Vista has not loaded yet). Therefore it could be your LCD or your video card or your motherboard causing this to happen. This is where an external monitor would help you narrow it down. If it works well with an external monitor then consider replacing the LCD.
On the other hand, if LCD is not fuzzy in BIOS setup, then it is possible that it could be a Vista problem.