Operating System: Windows 98 (Note: might work with other versions of this os.)
Before downloading: Run Free Scan for Instant Driver Updates
3Com 3CN3BM556 Driver. This is the 3Com mini card modem driver model 3CN3BM556 not B. Unzip the files to a folder on your hard drive. Delete PCI Communication device in system device manager and reboot computer. When New Communication Device is detected search the unziped folder and it should work.