You could bypass the AOL-provided DSL USB modem software driver.
You need to know exactly the means of DSL connection. Generally, there are two options:
(a) standalone DSL router: faster, can work with your machines off, no driver or software conflicts, easier to setup a LAN behind DSL, easier to share internet between machines, more secure, etc. The modem is slightly more expensive.
(b) USB DSL modem: slower, need a slave machine, possible driver, software or OS conflicts, trickier to setup, not so easy to setup a lan, less secure, etc. It's the cheapo option.
Option a: it works flawlessly with any OS, safely ignore their clueless OS requeriments. Ignore as well their comments about requiring a serial M$ windows soft, I just configured a DSL router this weekend using only ethernet.
Option b: ask what model of DSL modem you get, some even have MacOS X drivers. Consider buying a standalone router in the future.
dani++