You have MSN?
I don't think it'll work, just due to the simple fact that Microsoft owns MSN, but if you can get it to, I'm sure a lot of other people would be interested in how...
As far as the modem goes, it may be a Winmodem, especially if it wasn't detected at installation, but it might just be that you need to turn OFF "PnP OS" in the BIOS. This won't affect Windows. If it's a Winmodem, you will have more luck finding a driver at linmodems.org.
Wait a minute, are you planning on running 2 OS'es at the same time on the big computer? You can't do that. You can't run Linux on your monitor and still have Windows on the other one...