So looking through one of the laptops and trying to defrag it won't let me do it since there is no such "AusShellExt.dll" in my computer so what is this thing and do I have to download it again for this thing to defragment?

Is it a virus or something that helps my computer, google wasn't much help and most of them had 'free scans' which I don't really trust.

Which anti-virus software are you using? Sounds like it found a false-positive with your Auslogic's Disk Defragger. You could go into your AV and delete the rule and reinstall Auslogic's, or you could just use the default Windows defragger.

The company I work for gave me this thing and one of the programs that came with it were AVG Internet Security 2011, AVG PC Tuneup and I use AVG defrag which found the problem which said I needed AusShellExt.dll to continue defrag it.