Virus or threat..help!

Hi, I noticed my computer was running slow the other day (programs not responding) so I looked it up and said it might be a virus. I am on safe mode so I ran a full scan with avast and it detected 1 virus, but when I review the results and try to delete the items or move to chest nothing happens when I click apply. Anything I can do?
Thanks!

can you attach a screenshot of the scan result?

slow machine can also mean that it is a long time since you did some house cleaning!