Tom:

Terry's comment is spot on, however, you may find that in certain
situations, you can't open your reports in design mode to change the
printers if the original network printer that a report was set to use no
longer exists on the network.  If you can open it in design mode and then
from File - Page Set Up, reset the report to use either the default printer
or a new specific printer on the network.  If you can't get the report to
open in design mode,  then if the NT box is still around, re-add it to the
network as a BDC or member server (assuming that the printer targets are
still set up properly on that box and you don't change its computer name)
and then you should be able open the reports and then set them, as noted
above, to either user the default printer (recommended) or a new specific
printer based on the convention used by the 2003 server.