I tried to fax something from my laptop for the first time in a few months, but couldn't get a dial tone. The modem has always been on Com3, so I deleted it, restarted the computer, and it came back on Com7. I tried to change it back to Com3, but see that Com1, Com2 and Com3 are IN USE.

How can I find out what is using those ports? I have a WIFI setup, so I haven't used a modem for years. I don't fax very often, but it's nice to be able to when the need arises.

The diagnostics check out, so I think the hardware is working properly.

I don't know if I ever faxed anything since I did a reinstall during the summer, but I think that I did.

Thanks for any clues. This is an XP Home HP Pavillion 5400