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I was going to suggest that, but didn't want to. So long as you back up your db, you'll be fine. Before you restore your db, install your modules, then once it's restored, everything will be back to the way it is now. (minus the corupt .js)
I don't understand why it's not updateing properly. Be sure that your sites cache and template_c folders are clearead.
I'm kinda hoping that you don't have to do a reinstall, it's really not all that neccesary. Strange...
Good Luck