Random BSODs with increasing frequency, possibly video driver??

Hello,
I searched the site and read some of the other threads with this driver but most of them have been on new installs.
I have recently had a significant increase in BSOD and/or Win lock ups. Sometimes it crashes and autoreboots, other times I get vertical lines over the entire screen, and still others I get a flashing message of "Not Optimal Mode", even thought it is displaying the Optimal mode that the ATI software prescribes.

I have a custom built desktop machine I have been running for 7 years, with the only change in hardware being a couple of additional HD's about 9 months ago. There hasn't been a new video driver for my card in a couple of years.

Any assistance you can provide is greatly appreciated! Mini dump files attached per the websites protocol.

Code:

*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck A, {ffffffff, 2, 0, 8328b0e5}

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
*** WARNING: Unable to verify timestamp for atikmpag.sys
*** ERROR: Module load completed but symbols could not be loaded for atikmpag.sys
Probably caused by : atikmdag.sys ( atikmdag+25e28 )

Followup: MachineOwner
---------

0: kd> lmvm atikmdag
start    end        module name
9c800000 9d1eb000   atikmdag T (no symbols)           
    Loaded symbol image file: atikmdag.sys
    Image path: \SystemRoot\system32\DRIVERS\atikmdag.sys
    Image name: atikmdag.sys
    Timestamp:        Tue Apr 30 11:32:54 2013 (517F264E)
    CheckSum:         009A2A46
    ImageSize:        009EB000
    Translations:     0000.04b0 0000.04e4 0409.04b0 0409.04e4

WinDBG blames the very outdated video driver. Its not uncommon for older cards/older drivers to not work properly when Windows drivers are updated. We need to take a closer look at your hardware.

Run MSINFO, then save the results as a .nfo file, and upload it here please.

I'll take a look shortly.... got caught out by this season's flu.