Are you reporting each failure to Dell each time?
I find owners of many machines have problems during the warranty period but wait until the machine fails then it is out of warranty and they exclaim "I've problems since I got the machine."
The records however are clean and the claim is denied.
http://support.microsoft.com/kb/894278 tells of a TROJAN that can cause this. Read advice from Grif at http://forums.cnet.com/5208-6122_102-0.html?threadID=328220#2968150
My family have recent bought a Dell XPS 630i Desktop, and since unpacking it and setting it up, on occasion (about once or twice a day) randomly it gets a blue error page saying physical memory dump.
This page only last around 30 seconds, at the top of the page it says uninstall any newly installed software, which i have done, to no avail. still getting the error message.
Near the bottom of this page there is line of text that reads;
STOP: 0x00000050 (0xFA1D4180, 0x0000000, 0x8CED882, 0x00000002)
This is pretty close to all the information i can give you, not even sure where to start with this one, but please post any questions i can help you with to get this mess sorted out!
Here are my complete specs, just incase this helps:
Base system: Dell XPS 630i Desktop
Processor: Intel Core 2 Quad Processor Q9450
OS: Genuine Windows Vista Ultimate
Memory: 4GB dual channel DDR2 800MHz SDRAM
HDD: 500GB SATA hard drive
Video Card: NVIDIA GeForce 9800GT 512MB
Sound Card: 7.1 Intergrated
Thanks in advance