Time to learn how to do things the proper way - without kits !!!
There are some good guides for ADB here (I've linked one in my i9000 thread) and the guide by comminus for Nexus 7 is excellent to understand how fastboot is working. Otherways Linux OS is much more comfortable than Windows as it needs no drivers
Next time just always wipe /system next to data, cache and dalvik cache before installing a new ROM.
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