From what I've found, there are several Sober worms, all of which are Email Worms, although there's no information about Sober-I.
I'm no expert at this, but if it was me, I'd just delete all infected files normally. If you wish to read about the different types of the worm Sober,
you may do so here.Sorry I cannot help too well, though I'm sure someone else here will be able to assist you.