BSOD after 7-9 Hours

I am consistently getting a BSOD after about 7-9 hours from startup on my Windows 7 Home Premium, 64 bit, ZT brand PC with 16GB memory and 2TB HD. When I reboot it runs fine without problems or symptoms for another 7-9 hours and then I get the BSOD again.

EDIT: I am getting this info on my desktop at start up:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.3
Locale ID: 1033
Additional information about the problem:
BCCode: d1
BCP1: FFFFF88005F8E000
BCP2: 0000000000000002
BCP3: 0000000000000000
BCP4: FFFFF880044D55F8
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1
Files that help describe the problem:
C:\Windows\Minidump\100213-25802-01.dmp
C:\Users\tom\AppData\Local\Temp\WER-45957-0.sysdata.xml
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C:\windows\system32\en-US\erofflp

I have run Spy Bot and Microsoft Essentials without improvement. I have a 2 week old System Image Backup on a portable HD and a 1 yr. old. system repair CD available.

Would greatly appreciate any assistance for a cure to this problem.

Thank you!

Please provide all the files following this tutorial so we can provide a complete analysis: Blue Screen of Death Posting Instructions

Please follow post 2