Hi,I have a cellular modem which is like a USB flash that works as plug&play.When plugging it in, the computer should recognize it, install the exe program in it and recognize the flash as a modem.What has happened, was really weird: The OS recognized the device (as I saw by the device's led which turned to blue) but it seems that the driver wasn't recognized though the computer didn't recognize it as a modem.I tried to install the driver manually, but again, the OS didn't recognize it..I really hope someone has faced this scene, and write some helpthanks in advance

This is a hardware driver issue. You'd have better luck in the hardware forumn.