I tried one driver but during the setup it stops when it says "Unable to open the help file".

Support Information:
Device Type: Modem / ISDN
Manufacturer: 3Com
Model: 3014
Interface: PCMCIA
Operating System: Windows 2000 Workstation
Age of Device: < 2 years old
FCCID:

Find it on DriverGuide (http://members.driverguide.com/index.php?action=srch&sm=b&aax=&qa6=2&qa5=10&qa7=1700&dp=2&qm0=3014&jmd=and&fzz=d) | Find it with Google (http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=3Com+Modem+%2F+ISDN++3014+Windows+2000+Workstati on+) | Research manufacturer 3Com (http://members.driverguide.com/index.php?action=getinfo&companyid=2)

which driver (filename) and where (url) is it posted?