That error usually refers to a hardware issue
Your PC is clearly older, you might want to make sure your new hardware is supported by it. I had an issue with a compaq that was unable to support a hard drive bigger then 180gb, so it can be anything
Another issue could be the gfx card, if it's AGP 8x (I'm assuming it's agp by your specs) and your board doesn't support that (It's AGP1x, 2x, or 4x max) that could cause issues as well. Or it could be the ram, I know you tested it but the ram itself may not be faulty, but could just be conflicting with your motherboard. Where did you get it from?

IRQL_NOT_LESS_OR_EQUAL normally points to bad RAM, drivers or conflicting hardware.

Have a look in event viewer for the event log and see if that tells you anything.

I ordered it brand new via circuit city.

Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7026
Date: 4/23/2008
Time: 10:27:49 AM
User: N/A
Computer: MATT-XXXXXXXXX
Description:
The following boot-start or system-start driver(s) failed to load:
mbmiodrvr
MRxSmb

For more information, see Help and Support Center at Events and Errors Message Center: Basic Search.






Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7001
Date: 4/23/2008
Time: 10:27:49 AM
User: N/A
Computer: MATT-9NEKY851O7
Description:
The Computer Browser service depends on the Workstation service which failed to start because of the following error:
The service has returned a service-specific error code.

For more information, see Help and Support Center at Events and Errors Message Center: Basic Search.




Event Type: Error
Event Source: Service Control Manager
Event Category: None
Event ID: 7024
Date: 4/23/2008
Time: 10:27:49 AM
User: N/A
Computer: MATT-9NEKY851O7
Description:
The Workstation service terminated with service-specific error 2250 (0x8CA).

For more information, see Help and Support Center at Events and Errors Message Center: Basic Search.



Event Type: Error
Event Source: Workstation
Event Category: None
Event ID: 5727
Date: 4/23/2008
Time: 10:27:37 AM
User: N/A
Computer: MATT-9NEKY851O7
Description:
Could not load RDR device driver.

For more information, see Help and Support Center at Events and Errors Message Center: Basic Search.
Data:
0000: 34 00 00 c0 4..À




Event Type: Error
Event Source: Workstation
Event Category: None
Event ID: 5727
Date: 4/23/2008
Time: 10:27:37 AM
User: N/A
Computer: MATT-9NEKY851O7
Description:
Could not load MRxSmb device driver.

For more information, see Help and Support Center at Events and Errors Message Center: Basic Search.
Data:
0000: 34 00 00 c0 4..À



Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 4/22/2008
Time: 2:28:42 PM
User: N/A
Computer: MATT-9NEKY851O7
Description:
Error code 1000000a, parameter1 8b660080, parameter2 0000001e, parameter3 00000001, parameter4 806ee2dc.

For more information, see Help and Support Center at Events and Errors Message Center: Basic Search.
Data:
0000: 53 79 73 74 65 6d 20 45 System E
0008: 72 72 6f 72 20 20 45 72 rror Er
0010: 72 6f 72 20 63 6f 64 65 ror code
0018: 20 31 30 30 30 30 30 30 1000000
0020: 61 20 20 50 61 72 61 6d a Param
0028: 65 74 65 72 73 20 38 62 eters 8b
0030: 36 36 30 30 38 30 2c 20 660080,
0038: 30 30 30 30 30 30 31 65 0000001e
0040: 2c 20 30 30 30 30 30 30 , 000000
0048: 30 31 2c 20 38 30 36 65 01, 806e
0050: 65 32 64 63 e2dc



Appears that driver warning appears upon startup every time.

It might be a good idea to run System File Checker.

http://support.microsoft.com/kb/841570/en-us

I appreciate your problem is not the same, but the error code points towards a corrupt or missing file.