Looking on the Sony site, they only offer unlocked drivers for XP. In the drop down menu they offer Vista business but when selected it states that no unlocked drivers are avalible for this OS. Sony eSupport - VGN-SZ770N - Software Updates & Drivers Are their any yellow triangels by these items in your device mngr? It appears that it came with Vista business but it dosen't say if it is 32 bit or 64 bit. Have you tried intsalling them in compatibility mode or have windows search for the drivers? Sony has that notebook listed under locked to an OS, and Unlocked but only will show drivers for XP. So your facing a compatibility problem with the drivers.
My Computer
At a glance
Windows 7 ultimate 64 bit / XP Home sp3intel Core 2 Duo E8400 3.0ghz8 gigs 1066 OCZ Fata1tyEVGA GTX 580 Call of Duty Black Ops Edition
Logitech Z2300 Speakers/ Bose Noise Cancelling Headphones/Avermedia PCI-e Hybrid TV Bravo/Epson NX415 all in one/ 4 Port Powered USB Hub/ LG 10x Bluray Burner /TSST Corp DVDRW External