[newbie] Modprobe SCSI card question

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I'm trying to load a SCSI card module, with the following
command:

modprobe g_NCR5380.o dtc_3181e=1 ncr_addr=0x240 ncr_irq=4

It tells me It cannot find the module, even though the
module is there in the /lib/modules/2.2.15.... blah blah
directory.  I can't run it from that directory either. 
Anybody know what modprobe is trying to tell me?  Do I need
something else in my path?

Or should I just give up and get rid of this crap SCSI card?
It's off a UMAX scanner.