"Phone Tools," my fax software program from BVRP, says "...com port unavailable."

My three-year-old Dell 4400 came bundled with a fax program, "BVRP Phone Tools, Version 2.17d."  Initially it worked fine.  Recently I had to reformat my hard drive.  After reinstalling this fax software, it no longer works.  When I try to send a fax, it pops up a window that says "com port unavailable, or being used by another application."  At the same time a small window in the main fax graphic says "Modem Manager disabled."  I cannot find Modem Manager anywhere in the program, or in Windows fax help.  I have already checked the BVRP support page.  With the exception of one unrelated driver, I can find nothing specific to my version of this program.

I have already disabled my firewall and antivirus scanner to no avail.  Additionally I disabled a browser accelerator program, as well as "Call Wave."  This is a program that transfers my phone calls to my computer screen.  I thought perhaps this program was occupying the com port, but even after disabling all of these, the problem persists.  By the way I use a Lexmark X73 all in one machine.  Apparently it includes fax software, though I have never used it, and besides my "Phone Tools" fax program worked fine originally, and that included the installed Lexmark printer.  Can't think of any other info I can give you at this juncture.  Please help!