I just installed Windows today and was surprised that adb did not work out of the box
Well Ubuntu didn't need any drivers, so I searched for the apropriate drivers but none worked for me, so I extracted the ones from the latest HTC Sync.
Those are tested by me to work with Win8 x64.
So here it is:
DOWNLOAD HTC DRIVERS
NEW Version: 4.10.0.001 on 30th nov. Please check Win8.1 compatibility and send me a PM wether it works or not.
NEW Version on 28th oct: 4.5.0.001 not tested my me, but they should at least work from WinXP to Win8, no Win8.1 compatibility yet, I'll check the next days for a new one.
NEW on 28th may: new version, the old did not work with JB for me.
Old ver: 4.0.1.002
New ver: 4.1.0.001