I have the same problem, Windows 7 doesn't recognize my sis 900 based ethernet controller.
I've tried to install the .inf but it didn't work
I did what u sayed:
Install like this:
"Download my attachment and extract.
Right click on the network adapter in the device manager. Update driver software. Browse my computer for software. Let me pick from a list. Have disk. Browse. Now navigate to where you extracted to and double click on the .inf. Click ok.
Can some one Please Help me =)