download driver cleaner pro via this link
http://downloads.guru3d.com/download.php?det=745
Read this guide on driver cleaner pro before doing anything
http://www.driverheaven.net/windows...stalling-installing-ati-drivers-properly.html If you need to, print the guide out so you will have reference material. Please be sure to follow the guides instructions exactly.
That is a guide for ATI drivers. Just replace ATI with nvidia since you have an nvidia card. One option that guide does not go in-depth about is the cab cleaner feature. Once you have ran driver cleaner in safe mode click tools then cab cleaner. Clean the Driver.cab file and the SP*.cab file. (* is a variable depending on what service pack you have)
Download Ccleaner from this link
http://www.ccleaner.com/download Ccleaner is a great free crap cleaner.
After driver cleaner has finished restart your computer normally and run Ccleaner. Run the cleaner option then run the registry cleaner option and fix any issues it finds.
Download the latest drivers for your video card and install them again. I know you have done this already. However, sometimes when you uninstall/update video drivers remnants can get left behind which can cause problems.
Another thing you want to do is. Update all the drivers for your computer (Audio, NIC, Chipset, CPU (if aplicable)
Something else you may want to do is run housecall from this link
http://housecall.trendmicro.com/ it is a free online virus/vulnerability scan that I believe to be an invaluable utility.
You are already testing the RAM with memtest so please let us know the results of the tests when you have completed them.
Now on to your latest minidump.
BUGCHECK_STR: 0xA
Probably caused by : win32k.sys
PROCESS_NAME: everest.exe
Details: Bug Check 0xA: IRQL_NOT_LESS_OR_EQUAL
The IRQL_NOT_LESS_OR_EQUAL bug check has a value of 0x0000000A. This indicates that Microsoft Windows or a kernel-mode driver accessed paged memory at DISPATCH_LEVEL or above.
Cause
This bug check is issued if paged memory (or invalid memory) is accessed when the IRQL is too high.
The error that generates this bug check usually occurs after the installation of a faulty device driver, system service, or BIOS.
Check the System Log in Event Viewer for error messages that might identify the device or driver that may have caused the error.
To access the event viewer, Click start, right click my computer, click manage. This opens the computer management window. Find event viewer in the left hand pane of the window and click the + sign beside it to expand. Click system and look for any red x's or yellow triangles that correspond to the BSOD's you are getting. Please post back with your findings.
I hope we can get this issue resolved for you soon.