Does one click root work for you? If it does, there is nothing wrong with your drivers.
Once you get one click root working, put the recover in the ADB folder that is part of one clock root.... then open that fold, hold shift and right click, select open command prompt, then type in the adb commands from the CWM instructions thread.
LG uses the same drivers for all their Android devices, I used their driver installer app and selected the Verizon LG Fathom since it didn't have the Thrill listed anywhere, have had no problems.
Me: LG Thrill, rooted, et al
Wife: Infuse, slaps my hand away before I can root it...