It technically could be done, but the best you could do is share your entire hard drive on the network (which is NOT a good idea regardless of the presence of a virus), map your host drive as a network share inside of the guest, then tell the virus scanner to scan the mapped network drive. You would not be able to scan the host machines registry, and thus would not be able to guarantee removal of the infection.
The best way to clean a virus is to boot into safe mode and run the scanner from there, but the only guaranteed way to remove a virus and be able to trust the machine again is to back up your data, wipe out the drive and reinstall the operating system.