Did you install the fastboot drivers? You may have to manually install them from that link I provided. I have never done this on windows because I don't own a windows computer but once you have the fastboot drivers installed they should stay.
While the phone is plugged in and in bootloader type this command and see if a serial number pops up
fastboot devices
Make sure you are in the directory you unzipped all of your files to. If a serial number pops up then your device is recognized and you can proceed with rooting.
had a lot of driver issues, but once I installed PDA net/and or the 32 bit drivers for my crappy Vista, it was fixed. READY TO ROM!!!
Cheers
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