If you get a version error, you need to first run jcase's "Flash any RUU" hack.
**
Note that (strictly speaking) jcase should have entitled his post "Flash any PB00IMG.zip ROM" because of another small complication: some ROMs do not have a compatible version of the "reboot" command (the RUU utility first uses the reboot command to put the phone into oem-78/RUU mode). If you insist on using the RUU utility, you can overcome this minor problem by first flashing a compatible ROM, such as PlainJane.
But, it is just as easy to flash the Leak-V3 PB00IMG.zip ROM,
which produces the identical result as the "Official" RUU.
Note also that if you have used the RUU utility, them you already have USB drivers installed on your PC, and so getting adb running on the PC does not require setting up the full-blown SDK (you don't need Eclipse set up) : just download the SDK, unzip it, and you are ready to rumble.
To reiterate: if you get a version error, you need to run jcase's "Flash any RUU" hack first; after that, you can either run the HBOOT+Leak-V3 PB00IMG.zip install, or the RUU. The PB00IMG.zip method has no dependencies, and is somewhat easier.
bftb0
** Note there is a minor mistake in the instructions given in the OP of the "Flash any RUU" thread; be sure to read the first dozen posts or so - the correction is given.