No problem. If you have windows 7, hit the window button and type 'cmd'. In XP click Start > Run and type cmd.exe
Then you'll need to change to your adb directory. For me, that was:
You *could* add that to the windows path, but I didn't. It's fine either way. If you don't have that directory, then you will need to get adb first. That all being said, to root your device you might not actually need adb. I'm not 100% on that.
Hope that helps.