Tecra M1 - Modem doesn't work (can't open a port)

I have a problem: After reinstalling WinXP and drivers on my Tecra M1, modem doesn't function. It even can't diagnose itself - there always comes a warning: "Can't open a port (COM). It may be used by another device or application". I installed the latest Toshiba drivers for the modem, but nothing changes. How can I fix it? Looking forward for your advices!
Best regards.

Hi
Did you install the drivers in the right order? Not? So do it!
Did you install any additional devices or software which could has a bad influence on the modem?
Check the modem status in the device manger. Can you see any yellow exclamation marks?
Try to start the modem test within the Operating system.
Check the Modem function under
Start -> Control Panel -> Phone and Modem Options -> Modems Tab -> Properties -> Diagnostics
by pressing the "Query Modem" button.
If the Modem Information window contain a list of AT commands (including ATI2, ATI3, ATI4 etc.), then the modem is correctly installed. The ATI5 command ends in with the number for the selected Regional settings (for example Germany = 06).
To change the Regional Setting please use the Toshiba Internal Modem Region Select Utility.

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