Halo Modding Noob with a few questions...

[Quikfeet]

I accidentally patched the NMP's Driving Rock level with the star wars mod, and now it wont load, is there a way to revert it back to normal? I already tried to reinstall the map. Also, if I want to revert my blood gulch back to normal after a mod, all I need to do is use HHHT to retrieve its cache and revert it right? Also, HHHT can link to my box through the ftp, but it never downloads the cache files, wtf? Any help would be nice. Im new to the scene Thanks.