Windows 7 Computer - BSOD and restart

My computer randomly crashes and receives a BSOD. The BSOD is IRQL_IS_LESS_OR_EQUAL

I checked the event viewer and I'm seeing the following error:

The computer has rebooted from a bugcheck.  The bugcheck was: 0x00000116 (0xfffffa800e66c4e0, 0xfffff8801076d5b0, 0xffffffffc000009a, 0x0000000000000004). A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 082710-12105-01.

As well as: The previous system shutdown at 12:44:38 PM on ‎8/‎27/‎2010 was unexpected.

And under "Application" in event viewer..I'm seeing errors of the Bonjour Service...

that say: "Task Scheduling Error: m->NextScheduledSPRetry 2013" for example. But those are at different times from the crash, so not sure if they are related.

What can I do to know what's the cause of this?

IRQL_IS_LESS_OR_EQUAL is almost always caused by a buggy driver. Try updating every driver you can find from the manufacturer.