I would recommend updating or re-installing your modem driver. This should correct the problem. Also, when you're at the company's website, check their KB or support site to see if there's a patch for this problem. MS has a KB article relating to a similar problem, but use this only if upgrading the modem driver doesn't work.
Disable power management for your computer's COM port. To do so, use Registry Editor to modify the following registry key:
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