You can either leave it in quarantine or you can delete it from quarantine (open CAVS and click on quarantine and then click the quarantine button). Might be worth trying the repair button before you finally delete the file.
You should ensure the detection is not a fasle positive before you delete it - I would leave it in quarantine for a while and then try repairing it - if it is a false positive CAVS may restore the file at a later date when its database has been updated.
