* This is not original from me *
Link to Original *
I using tethering all the time with my phone. I used a non-freeware program called PDAnet until I recently ran across this tip over at PPCGeeks for WinMo 6.1.
Install attached .cab file.
1)Open Up your browser on your phone and wait for it to display a webpage.
2)Minimize the browser
3)Open up Internet Sharing in your programs folder on your phone
4) Choose USB under PC Connection
5)Hit connect (bottom left)
6)Turn OFF the Wi-Fi on your PC
7)Connect your USB cable to your phone & PC
Works like a dream!