Hmm, there are a lot of kmode_exception_not _handled which are not giving much information that's useful.
There is a system_service_exception which generally indicates a graphics driver is at fault.
Your .dmp files go back to the 02/01/2014 which is the 2nd of January. Is this when the problem began? If so it might be graphics card related. I have found your graphics driver, windows hasn't called it directly responsible so I'm not 100% certain it's the cause. Anyway, here's the analysis on the driver.
Code:
*******************************************************************************
* *
* Bugcheck Analysis *
* *
*******************************************************************************
Use !analyze -v to get detailed debugging information.
BugCheck 3B, {c0000005, fffff80003295e61, fffff8800a3b7120, 0}
Probably caused by : ntkrnlmp.exe ( nt!KiSignalSynchronizationObject+51 )
Code:
SYSTEM_SERVICE_EXCEPTION (3b)
An exception happened while executing a system service routine.
Arguments:
Arg1: 00000000c0000005, Exception code that caused the bugcheck
Arg2: fffff80003295e61, Address of the instruction which caused the bugcheck
Arg3: fffff8800a3b7120, Address of the context record for the exception that caused the bugcheck
Arg4: 0000000000000000, zero.
Code:
fffff880`04800000 fffff880`048a0000 atikmpag (deferred)
Image path: \SystemRoot\system32\DRIVERS\atikmpag.sys
Image name: atikmpag.sys
Timestamp: Fri Dec 06 20:21:45 2013 (52A231D9)
CheckSum: 0009FEFF
ImageSize: 000A0000
Translations: 0000.04b0 0000.04e4 0409.04b0 0409.04e4
As you can see, the graphics driver was updated on the 6th of December 2013. The BSODs started on the 2nd of January.
You can try and reinstall a newer version of your graphics driver. It shouldn't cause much harm. here's some instructions to follow.
How-To Install AMD Catalyst? Drivers For A Windows® Based System
BUT, before you update it, I would strongly advise creating a System restore point in case it installs a buggy version. Better to be safe than sorry. Here's some instructions to follow on creating a restore point.
System Restore Point - Create