winXP, lexmark, won't print - 'local downlevel document'

[Rebecca]

As of two days ago, my printer was working fine.
Yesterday, I am unable to print. I have a lexmark c750
connected through my usb cable. I have reloaded drivers.
I am still able to print to our network computer. I have
found some info that it may be some type of virus or
worm, but I have run norton & housecall and have found
nothing. Any help would be greatly appreciated.
thank you.