You got the OTA update that enables wifi calling and usb/wireless tethering, right?
On your G2 Go to Settings, Wireless & networks, Tethering & portable hotspots, Help.
Under this help guide, go to the website link for USB listed there.
Go to this website and choose "USB Tethering with Windows XP"
Download the INF file "tetherxp.inf"
On your G2 check the "USB tethering" option, and connect your G2 via USB cable to your computer. Instead of using windows to automatically seach for drivers, direct the wizard to the "tetherxp.inf" file.
This will also work for Windows 7 if your having problems tethering there.