After some days with my computer crach many times, i had find that the problem for these blue screens (XP) is a modem driver file (ltmdmnt.sys). I have an internal v92 pci modem (Zoom v92 pci), and i've tried to find a driver update from the official site. They ask me what chipset have my modem (this can be find from the modem's serial number), but i'm not sure what is the correct driver file to download. Please, if anyone can help me somehow, my modem is dialup 56k internal pci V92 from Zoom Telephonics, and the serial number of this product is: 1922-Z0780-70-1N-0150
Sorry about my bad English, (i'm from Greece) i'll waiting for any solution if there is any. Thanks a lot.