It depends on what the virus did and what the anti-virus needed to do to get rid of the virus. Are you using windows? If you are do all your drives and partitions show up in disk management? They might just not be assigned drive letters, you should be able to right click and select change drive letter and path to set them to normal.
if you are looking for lost files, you can try file scavenger, or get data back, (one for FAT and one for NTFS). Also, if it is picture files you are missing, you can use flash fixers program, that is great.