For Windows 7, first try to find drivers specifically for it. If they are not available, the Vista drivers might work. The XP drivers probably will not work.
What is the device?
My Computer
At a glance
Windows 7 x64 HP, Windows 7 HP, Windows 7 UltIntel I3, Cerelon, Pentium 4 @ 3Ghz8G, 3G, 3GOn-board Intel, On-board nVidia, nVIDIA card
Home LAN through Linksys hub to 4 port and wireless switch/router. Networked HP 2600n. Wife's computer running Windows 7, and spare laptop running Ubuntu "Karmic Kola" (9.10).
Windows 7 is built on the same kernel as Vista. This would indicate that alot of Vista drivers may work in Windows 7 - this has been my experience anyway.
Use Vista drivers if 7 are not available yet. So far I have had one driver issue with my printer that Epson states their driver for Vista will work with 7 and it does not. The printer works but I might not have access to all it's functions at this time.
My Computer
At a glance
Win7 64AMD Phenom X4 9950 2.6ghz8 gigs Corsair2 X Nvidia Geforce 8800 GTS (G92) 512 in SLI