Does the icon in your system tray sit there not blinking? One possibility is you’ve hit a bad line card in the CO (there’s a couple in one concentrator out here). Another is that the telephone line disconnected you and Windows is SO STUPIDLY USELSS it didn’t notice.
Do an ipconfig /all. Then ping the gateway (or DNS) listed. If you get no response, that’s exactly what happenned. Data modems are unforgiving. They will disconnect with 1/4 second break in the line (called hookflash, ie for call waiting) rather than the needed 3/4 break for a phone.
Do you have an old BC Tel phone? A real teclo one with a dial or early pushbuttons. Unplug you line from the jack, plug in the phone, pick it up and dial 2 or 3 (to kill dialtone). If you hear ANY crackling, hissing, scratching you have a bad line. While you’re down there make sure the cord to your modem only has 2 contacts in it instead of 4 (eliminate 1 more possibility).
If you do hear hissing, you’ll have to figure out if it’s from inside (your problem rewiring) or outside (the phone co problem). Call 611 they’ll tell u how