BSOD and Limewire

I have a Dimension 4100 1Ghz, 512mb RAM, 40gig HD that I just bought a few weeks ago. It's the SECOND such system in a month and a half! (The first one crashed and even hours on the phone with Dell techs couldn't revive it so they sent me another one 10 days ago) Until tonight I'd only had one BSOD (when I was taking some programs off the start menu a couple of days after I'd received the machine). Tonight I downloaded Limewire (a substitute for Napster) and began trying to use it. I was rudely shown a BSOD. I rebooted, started Limewire again and was shown the same BSOD. Anyone else have this problem?