As I said I had done a Boot Scan and had it set to repair (clean) and 4 times it said it was unable to clean the 4 virues it found. I then did another scan with the settings set to "delete" and no virues etc were found.
I wanted to know what happened to the viruses that avast found but could not clean in the first boot scan?
Thank you for the reply, that information was useful. I have set my settings to "quantine" as a result.
EDIT: ok then, thank you.