Which virus did it say anyway?
If it's a real nasty one, you need to be more worried than if it's a relatively simple one.
Packed in the archive, the virus is harmless!
Unpacked but not executed, the virus is harmless - and might be cleanable (and will certainly be deletable by the AV, if it isn't cleanable).
The archive itself, may be discarded without risk - though I'd at least use a SHIFT-Delete on it to avoid it hanging around in the recycle bin, or empty the bin after - and then repaet the AV scan and make sure you come up clean!
MOST AV programs cannot clean or delete within archives - and deleting the entire archive would be a rather strong step to take.