Hi Mil,
Several things could be suspect. For starters, I would not run Kazaa 7/24. Do I assume correctly that you are running a dialup connection to the Net?
Ok, if the BSOD refers to your modem, first thing I would do is remove and reinstallthe drivers. To do this, go to your Device Manager and remove the device. Reboot and let Windows redetect it and then provide the drivers when prompted. This MIGHT resolve it. Try reseating the modem in the slot, as it may be shorting or just not seated properly. One thing you can try is selecting a different slot (if available) or replacing it with a known good modem. If you have a broadband connection, simply disable the device in the Device manager. I have a Legacy USR modem which didthe EXACT same thing to me.
You mentioned you have installed Office XP. Office by default will set itself up in your startup group. This has been known to cause some problems. Just go to Start | Programs | Startup and delete that shortcut.Spontaneous reboots could be indicative of a virus. Download the latest virus defs and run a system scan. Also there may be a power issue someplace as well. If you are running with multiple devices, drives on a 250 or 300W PS, my recommendation is investing in a more robust PS. Antec has great units with dual fans (one blows directly on your proc keeping it at least 10 degrees cooler) starting at around $50 thru Newegg.com. Having more power is ALWAYS a good thing! ;)
Finally, do you recall the last thing you installed prior to this happening? If so, try removing that program or device and see what happens.
But I totally discourage anyone from running Kazaa 7/24. This program has a LOT of backdoors for hackers to get in. Just use it when you absolutely need it.
Good luck and this helps! Let me know what your final resolution is. :)
Regards,
Jesse