you did install the HTC drivers right? it's not going to see the phone unless you do...
also, you load the RUU file to the root of the SD card during the root (you'd load the radio file there too, but that's after the root process since you have to select it's .zip file to flash it, but don't worry about it if you're not rooted yet). but you don't really need the radio if you've already done the recent GB OTA. I did the GB OTA last week, and just rooted mine last night with Rev, and it worked flawlessly (and much faster than I thought it would been). the original rom worked great rooted, but my entire intention on rooting was to flash BAMF 1.0.9 and get Sense 3.0, and I've done that already and it too is working flawlessly, and I haven't touched any radio files at all
I say reinstall the HTC drivers, make CERTAIN the phone is in debug mode (settings -> apps -> USB debugging mode CHECKED), plug the phone in and let windows autodetect it and make the connection, then right click on the Rev app and click "run as administrator" and see what happens then