You might need to reinstall all your drivers,
when I created a new computer my graphics card was completely unsupported (ati 4870HD) until I installed the drivers, the screen resolution was limitied to" 640x480 256 colours"
My LAN card was also unsupported, required drivers to connect to my router
but when I fresh installed windows 7 on a formated hard drive I didn't have that same problems, auto detect internet and graphics card, the drivier data I think is stored in the motherboard ROM
I had a similar situation on my old computer