Pull the battery, wait a few seconds, and power back up.
The screen you got to is the HTC default recovery image - the 'searching for drivers' you saw was Windows seeing the phone in a different state than normal - namely, the phone wanted to connect to the HTC updater program to load a flash ROM from your PC.
This probably means that the recovery image did not get flashed to your phone properly, I'd try that step again once you've got the phone back up and running.
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