I mean it can pretty much be caused by anything as the following says from MS(in my own words did you use your computer today? Yeah that could've caused your problem. Okay now just tell me how to fix it):
Stop hex 0000000A or IRQL_NOT_LESS_OR_EQUAL
The Stop hex A message indicates that a kernel-mode process or driver attempted to access a memory location to which it did not have permission, or at a kernel interrupt request level (IRQL) that was too high. A kernel-mode process can access only other processes that have an IRQL lower than, or equal to, its own. This Stop message is typically due to faulty or incompatible hardware or software.
Personally the way I get rid of this message is to reboot and hope it goes away.
If it returns then I start thinking really hard if I installed any new software,driver updates maybe,games could be just about anything really? Most often I've seen it caused on my own hardware by installing some drivers for a raid controller that wasn't compatible with my hardware.Using a different driver version fixed it. Other times I have seen it randomly popup with a machine that had bad memory.
Another machine I never did figure it out and just reloaded windows and that fixed it.
"I'm getting random reboots in a computer running XP Pro with all the latest updates, into which i've just installed a TV tuner/capture card."
That sounds like the smoking gun to me so I'd try 2 different things in your case.
1. Find latest drivers for your tv tuner card and install them
2. If above doesn't work/help take card out and try it in a different pci slot.
sorry to say that without actually being there firsthand to check it out can't really say much else about this other than I'd recommend finding some local computer guru to help you out if you can.
Anyways if I really had time to mess with it and try to fix it I usually check out the microsoft knowledge base to see if I can find and answer there and that's the first thing most other techs will do if it's not an obvious problem.
p.s.
Resolving the Problem
The following suggestions are specific to Stop hex A errors. A Stop hex A message might occur after installing a faulty device driver, system service, or firmware. If a Stop message lists a driver by name, disable, remove, or roll back the driver to correct the problem. If disabling or removing drivers resolves the issues, contact the manufacturer about a possible update. Using updated software is especially important for multimedia applications, antivirus scanners, and CD mastering tools.
A Stop hex A message might also be due to failing or defective hardware. If a Stop message points to a category of devices (video or disk adapters, for example), try removing or replacing the hardware to determine if it is causing the problem.
If you encounter a Stop hex A message while upgrading to Windows XP Professional, the problem might be due to an incompatible driver, system service, virus scanner, or backup. To avoid problems while upgrading, simplify your hardware configuration and remove all third-party device drivers and system services (including virus scanners) prior to running setup. After you have successfully installed Windows XP Professional, contact the hardware manufacturer to obtain compatible updates.
For more information about Stop hex A messages, see the Microsoft Knowledge Base link on the Web Resources page at http://www.microsoft.com/windows/reskits/webresources. Search using keywords winnt, hex 0000000A, and hex A.
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