Hi, Self (not myself, but yourself--aaah, you know what i mean)!
I agree with Dr. W.
Another possibility: There is a hardware, firmware or software problem with your modem. Has this modem ever worked correctly on this computer before?
One other question: Were any changes made just before this happened? (For example, did you add a new expansion card (like a video card), or more RAM (memory)? or did you install a new software program?)
Please let us know.
Doc