Sorry if this is the wrong forum to throw this at...
A few months ago I started getting the dreaded IRQL_NOT_LESS_OR_EQUAL Blue Screen. Not consistently, maybe once or twice a week, enough to be severely annoying. It only seemed to happen when I had my Dell monitor plugged in to the USB port on the back of my desktop (the monitor has several card readers and a USB hub built in). I rarely used the card readers, but I had a printer and a wireless mouse receiver plugged into the USB hub. I couldn't figure out an obvious way to solve the problem correctly, so I took the lazy approach and plugged the mouse dongle/receiver into the USB port on the front of the computer and only plug in the monitor's USB connection when I needed to print something or use the card readers. So far so good.
Fast forward a couple of months. I plug in my external hard drive to the 2nd USB port on the front of my computer and leave it plugged in all night (I rarely do this). Next morning IRQL_NOT_LESS_OR_EQUAL again.
So it seems that it's a more general USB issue than my monitor's USB system being messed up (monitor not USB-connected when this last BSoD happened).
Everything looks fine in the device manager. Other than this the computer seems quite stable. As far as I can tell USB devices seem to work fine.
Following are my system details (from Belarc Advisor - the mobo is ECS GeForce 7050M-M). Any suggestions on how to fix (or even effectively get around) this problem?
Windows XP Professional Service Pack 3, v.3264 (build 2600)
Enclosure Type: Desktop
Memory Modules c,d
3328 Megabytes Installed Memory
Slot 'DIMM0' has 2048 MB
Slot 'DIMM1' has 2048 MB
Slot 'DIMM2' is Empty
Slot 'DIMM3' is Empty
Local Drive Volumes
c: (NTFS on drive 0) 320.06 GB 134.49 GB free
l: (NTFS on drive 1) 500.11 GB 142.35 GB free
EPSON Stylus Photo R380 Series on USB001
Send To Microsoft OneNote Driver on Send To Microsoft OneNote Port:
Primary IDE Channel [Controller] (2x)
Secondary IDE Channel [Controller] (2x)
Standard Dual Channel PCI IDE Controller (2x)
NVIDIA GeForce 8500 GT [Display adapter]
DELL 2405FPW [Monitor] (24.2"vis, s/n T613361M0E0S, January 2006)
Standard Enhanced PCI to USB Host Controller (2x)
Standard OpenHCD USB Host Controller (2x)
Realtek High Definition Audio
NVIDIA nForce Networking Controller
primary Auto IP Address: 192.168.1.6 / 24
Dhcp Server: 192.168.1.1
Physical Address: 00:1B:B9:FE:BE:BB
Networking Dns Server: 192.168.1.1
Acronis True Image Backup Archive Explorer
HID-compliant consumer control device
HID-compliant device (2x)
USB Human Interface Device (2x)
Logitech HID-compliant Cordless Mouse
PS/2 Compatible Mouse
NVIDIA Network Bus Enumerator
USB Composite Device
USB Mass Storage Device
USB Root Hub (4x)
pcouffin device for 32 bits systems
I would download and install the latest video card driver (I don't see where you listed your video card in your specs). Also, I would go into BIOS and adjust the RAM voltage, timings and speed to your RAM manufactuer product specifications. If your system at some point ran without the OS stop error before you installed additonal hardware (like RAM or video card w/drivers) remove them or set the hardware up correctly in BIOS and use correct/uncorrupted drivers (video card).