in device menager,i got interrogation point beside the modem,and its written Pci

Support Information:
Device Type: Modem / ISDN
Manufacturer: Lucent Technologies
Model: pci modem
Interface: Other
Operating System: Windows XP Professional
Age of Device: Not specified
FCCID:

Find it on DriverGuide (http://members.driverguide.com/index.php?action=srch&sm=b&aax=&qa6=609&qa5=10&qa7=1500&dp=3&qm0=pci+modem&jmd=and&fzz=d) | Find it with Google (http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=Lucent+Technologies+Modem+%2F+ISDN++pci+modem+Wi ndows+XP+Professional+) | Research manufacturer Lucent Technologies (http://members.driverguide.com/index.php?action=getinfo&companyid=609)

Lucent doesn't make modems, only chipsets. They sell them to system manufacturers who use the chips to make their modems.

Please provide a valid manufacturer and brand along with the brand and model of the pc in came installed in.

And if the modem has a number on the Lucent chip, write it down and include it in your next post.