ANSWERS: 1
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I think it is unlikely that you can roll-back because 2007 overwrites the previous program. If you have restore points you may be able to restore back to pre-install. If not you could always re-install it unless it came as part of your operating system then it may be in your recovery, failing all of the above use a peer to peer site and download it and reinstall from the downloaded version. take note: the p2p will be an illegal copy.
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