All you need to do to enable USB tethering in Windows is edit the build.prop to get Phone as Modem to be included in the USB notification dropdown menu.

Simply edit the line ro.modem_available=0 to ro.modem_available=1.

Then reboot and connect the phone to the PC and select Phone as Modem from the drop menu.

You will get a notification that internal data will be disabled.

Open Network and Sharing Center and create a new DialUpNetworking connection and configure as follows:

User Name: XXXXXXXXXX@vzw3g.com where the Xs are your 10 digit MDN.

Password: vzw

Number to Dial: #777

Save and hit connect and you're done.
CellZealot

TeamBlackHat

Digital alchemy for the Droid and beyond.