What is your chest limit set to? Normally, it's 256MB I believe. You can always increase the size of the chest if needed, (as long as you have the hard drive space to accommodate it).
It's not smart to delete the files in the chest until you absolutely know that they aren't needed.
I'd increase the size of the chest, run the scan again, and send everything to the chest. From there, you can do more research as to what's bad and what's not.