printer and Trojan

I have a problem: due to some Trojan (as I suspect), my computer refuses to establish any connection with the printer – I can't print or do anything at all... When I try to reinstall the printer (I have the bootable disk, everything is there), I get the message: "print subsystem is unavailable" Please help, if anyone knows anything about this... I don't even have anyone to consult with, and I need to solve the problem urgently... I'm helpless without a printer :(:(:(