Windows 7 reboot issue

WIndows 7 pro on Optiplex 755 4 GB RAM and ATI HD Video card.  Seems to be every 40 minutes to an hour between symtoms.  Windows 7 is fully patched.  System shows no hardware issues that I can see (not heat related)
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Anything show up in Windows 7's Reliability Monitor?  (Type reliability in the search box at the bottom of the Start Menu, and click on Reliability Monitor when it gets listed in the search results.)
Rory de LeurConsultant End-User ComputingCommented:
Did you add/change any hardware before this (vga/Memory), or updated a driver(s) from a vendors cd or website?
bschielAuthor Commented:
The computer has rebooted from a bugcheck.  The bugcheck was: 0x0000000a (0x000000000000004c, 0x0000000000000002, 0x0000000000000001, 0xfffff80002a6cd64). A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 040810-47081-01.

No hardware was changed and no drivers were added or changed
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Rory de LeurConsultant End-User ComputingCommented:
The dump that you added reported:
An attempt was made to access a pageable (or completely invalid) address at an interrupt request level (IRQL) that is too high.  This is usually caused by drivers using improper addresses.

Can you tell us more about the history of the machine,
- is it new or did you upgraded (from what) or is it a fresh install
- had it always this problem, or just the last few days
- etc..

Rory de LeurConsultant End-User ComputingCommented:
Ps. A kernel error can also be a memory issue, if you run memory diagnostic you can rule out this option
Use Memtest86+ to diagnose your memory problems, you can get an ISO copy here:
bschielAuthor Commented:
Well I spoke with Dell about this issue and they had a BIOS fix for this issue.  upgrading to lastest BIOS was the answer to this issue.  
Thanks all for your suggestions and input.

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Windows 7

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