IRQL Not Less Than or Equal to BSOD

[Parrallax]

Hi guys,
I've had a media center PC that I've had ongoing BSODs with. I really don't know what it may be, but I have an awful feeling that it might be the TV Card. I have tried to keep all the drivers up to date but I can't stop the BSODs. If anyone could help me identify what's causing it I'd really appreciate it.
I've attached the dump files as instructed for the last three BSODs.
Thanks Again

 

[ttran]

Hi and Welcome to SF

STOP 0x000000D1: DRIVER_IRQL_NOT_LESS_OR_EQUAL http://www.carrona.org/bsodindx.html#top

Usual causes: Device driver
STOP 0x0000000A: IRQL_NOT_LESS_OR_EQUAL http://www.carrona.org/bsodindx.html#top

Usual causes: Kernel mode driver, System Service, BIOS, Windows, Virus scanner, Backup tool, compatibility

2 things were blamed in the dmp. They are your Realtek Ethernet driver and ATi video driver, please download and install fresh copy of them (make sure to remove all trace of old driver before updating new one).

BugCheck A, {fffff800031f82f0, 2, 8, fffff800031f82f0}

Unable to load image \SystemRoot\system32\DRIVERS\Rt64win7.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for Rt64win7.sys
*** ERROR: Module load completed but symbols could not be loaded for Rt64win7.sys
Probably caused by : Rt64win7.sys ( Rt64win7+15b0d )

Followup: MachineOwner
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BugCheck D1, {18, 2, 1, fffff88003e7fb0d}

Unable to load image \SystemRoot\system32\DRIVERS\Rt64win7.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for Rt64win7.sys
*** ERROR: Module load completed but symbols could not be loaded for Rt64win7.sys
Probably caused by : Rt64win7.sys ( Rt64win7+15b0d )

Followup: MachineOwner
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BugCheck D1, {fffff880034c4ebc, b, 8, fffff880034c4ebc}

Unable to load image \SystemRoot\system32\DRIVERS\atikmdag.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for atikmdag.sys
*** ERROR: Module load completed but symbols could not be loaded for atikmdag.sys
Probably caused by : atikmdag.sys ( atikmdag+290ddb )

Followup: MachineOwner
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Let us know if you need help

Tuan