This seems to work the best
1.) Boot up your PC
2.) At Windows 7 boot up press F8 then go to select Safe mode with Netowrk support
3.) Go to Device manager
4.) Select delete your Network adapter
5.) Refresh then re-install your Network adapter
6.) Select manual install point to your either PC or MB maker's original network
driver
7.) After installation your are done! Re-Boot to Windows 7 again then fly.....
-Source :
SiS 900-Based PCI Fast Ethernet Adapter