The boot scan does a deeper scan and will look at rootkits as well. The scan usually takes a bit longer.

When you are in doubt as to what action to take, it is safer to put something in the Virus Chest where it is safe. From the Chest, you can always rescan the item and if clean restore it back to the machine. Sometimes, at a later date with updated virus definitions, items in the Chest come back clean. Other times they are true infections and must remain in the Chest.

If you ignore, you never know if the malware is a false positive or really an infection. So to play it safe, put it in the Chest.

If you delete and it is a vital file you need for something to make your machine run, you are out of luck! Better to put it in the Chest where you can always rescan and restore if needed.