I need urgent help my computer a home is a NC866AA Presario sr5890an DTP - HNX, and its Ethernet port wont work after i installed windows 7 ultimate from vista . i have downloaded a driver for my computer but it will not install because my version of windows 7 hasn't  been activated and it says it is not genuine because of this reason i have tried to activate it offline but it says the product key is invalid.

but all i really need is the Ethernet driver for it to work if i can get that i can get the rest to work. And i need to do online studies and i cant keep going down to my local librbary and use their computers.

so if any one could help can you help me quickly it wold mean alot to me . thanks!