Sometimes, after a virus infection, disk drives, flash disks and other media will not open when double clicked, but only when right clicked then open is selected.
This is because of a hidden autorun file left by the virus infection and the antivirus failing to delete it.
To fix this do the following.
Select run from the start menu and type cmd
if the drive with the problem is C:\ type C: and so on
write attrib autorun.ini -h -s -r
press enter then write
close everything and restart your computer.
Comment if you need any more help.