That model# doesn't ring at all. I suggest you crack open the case and take it from there to verify what card is there. But, if this was supplied by Acer, there's agood chance they have the drivers required. Delete the listing for the modem and after getting the modem driver, point it to that source. If you have the system CD by Acer, there should be a driver there too. The updated drivers opn the other hand need to be researched. Thus, you need to verify what modem or at least the "chipset" involved. Like Rockwell XYZ123, or Lucent AAA123, or Motorola ABC555-A for *any* possible updates. Here's a website for drivers links:
http://www.hardwarehell.com find modems and then surf the links. I found http://www.driversguide.com after registering(free) a great source now and later(if required).

good luck -----Willy Grin