It shouldn't mess up all your other V4 files. They are separate files from V4 and shouldn't be affected. You may have just installed V4 to the wrong directory, or you might need to refresh your Poser library. I don't know if you're on a windows or mac machine so I can't really be much help with locating them, but you can look in your main file explorer and see if the V4 cr2s are still where they're supposed to be.