I had a similar problem.
when i got my computer back from a system clean for a virus, my printer wouldn't work.
I tried reinstalling the software but to no avail.
I then gave it back to the company to fix and they said that I had plugged it in wrong but I know I hadn't. It turned out that when they were doing a system clean, they got rid of info needed to use the usb ports. Thank god the computer still had a warrenty.