I have an ActionTec PCI data/fax/voice (deskvoice pro)running on com4. My mouse is on com2, but was on com1 before this problem. It was doing it with mouse on com1 also. When I DUN half the time my pc locks up after dialing and before chcking username. I check the fone and there is a dialtone like it never dialed. After rebooting I get the same thing, a 50/50 chance of connecting. I have yanked the modem and moved it to another slot before deleting and reinstalling and I got the blue screen of death. I have uninstalled and reinstalled EVERYTHING, even formatted and reinstalled windows.