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Thinkpad T21 Usb Modem problem

Hi, I have problem with my USB modem. It's cricket usb modem, and before it worked fine. After re installation of laptop i set up drivers and i connect on internet but after 2-5 min it cannot receive connection. I checked if is because serial port, it is on com4. I turned off serial port in bios, and still same. It shows some error on modem log. It shows like it couldnt receive conection. Also modem worked on other computer, and i use wind xp. Drivers that i downloaded are from Lenovo web site.
I need help.
Thank you

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