I'm sure if you know the name of your winmodem you can quite easily find a driver for it by searching on Google.
As for the errors:
log in as root
Error 2 can be fixed by:
ln -s /dev/ttyS2 /dev/modem
Error 6 can be fixed by:
cd /var/lock
ls
there should be an entry here referring to either /dev/modem or /dev/ttyS2, you need to delete this entry:
rm LCK..modem
'LCK..modem' is just an example, that is what the file i had to delete was called whne i had the same problem.
I know this is probably too late to help Mr. Matt, but I hope it can help some others out there.
- Kat