No problem Jeethro, just it will put people off trying a perfectly good mod if you stick "warning" in a forum because of a rare happening - so I have to explain the other side of the coin.
There are no viri or other problems in OFF Jeethro - as I say 1000's of people would have complained otherwise
I would make sure you ore anyone download OFF using a download manager like we recommend (getright.com for example) on the download page. This would avoid the huge files getting corrupted.
Running any install program can cause problems especially if the drive, your registry, or the install exe itself is corrupted.
With ANY software if you have important data you should have a back up to hand before installing.
Always worth backing up anyway.. famous last words.