go to the lg website for the usb drivers.
i used a program from unlockroot dot com.
i would have posted links, but I'm new on the boards so i can't.
you can also find a guide to rooting your phone on this site.
http://androidforums.com/optimus-net-all-things-root/443725-optimus-net-all-things-root-guide.html
copy and paste the link w/the .html