Check the COM port settings. Maybe another device (infrared or other serial device) may have taken the com port that your dial application is expecting. See if your dialing application can change to another com port and if the same results happen when attempting to dial. You can also try clicking Start, Run, msinfo32.exe. There will be a modem item under system config summary. It will tell you information about the modem, driver, ports, etc. Did you do an in-place upgrade or did you wipe the drive and install from scratch? I know it sounds like a lot of work, but you should have done the drive wipe and install from scratch. Otherwise, you may continue to have issues like you describe above.