Use your original driver from either PC or MB maker then do the following:
1.) Boot up your PC
2.) At W7 boot up press F8 then go to select Safe mode with Network 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 W7 again