If you are unable to boot into the recovery you are going to have to flash a new recovery using Fastboot. Check out the guides on how to flash a recovery using fastboot under the dev sub forums. There are guides there on how to get to fastboot from a cold boot as well as the commands that you use use with cmd on your PC.
Current Phone: T-Mobile HTC One (M8)
Tablet: T-mobile Samsung Galaxy Note 10.1 2014
Phones not in use: G1, HTC Nexus One, LG G2X, GSM Galaxy Nexus, Nexus 4, HTC One, LG G-Flex, Note 3
If you don't have a Dropbox account join off me and get an extra 500mb of free space. http://db.tt/apgNbhRE