random BSOD's at random times

I have recently replaced the ram in my rig (4gb ddr2 667mhz) with 8gb ddr2 800mhz and was randomly experiencing BSOD's. done some searching, and decided to "underclock" the ram to 667. this helped for a while until a recent restart of the pc. Ran memtest86+ on both speeds (667 & 800mhz) and only got errors (8) on the 800mhz speed, and not exactly sure why. I have attached a dump file (not sure if I did it correctly) to this post if its any help at all. any help would be appreciated. thanks

Chuck if you got errors then mate you need to get the RAM replaced - it wouldn't matter if it were one or one hundred errors the RAM is still faulty.

PS Welcome to the forum

Turn off/Disable Driver Verifier when you test memory but your motherboard most likely doesn't support the higher speed or the memory module(s) is faulty.

Update or uninstall TeamSpeak3. It appears to be crashing your system.

Code:

 
DRIVER_VERIFIER_DETECTED_VIOLATION (c4)
A device driver attempting to corrupt the system has been caught.  This is
because the driver was specified in the registry as being suspect (by the
administrator) and the kernel has enabled substantial checking of this driver.
If the driver attempts to corrupt the system, bugchecks 0xC4, 0xC1 and 0xA will
be among the most commonly seen crashes.
Arguments:
Arg1: 0000000000000091, A driver switched stacks using a method that is not supported by
 the operating system. The only supported way to extend a kernel
 mode stack is by using KeExpandKernelStackAndCallout.
Arg2: 0000000000000000
Arg3: fffffa800aac2640
Arg4: 0000000000000000
Debugging Details:
------------------

BUGCHECK_STR:  0xc4_91
CUSTOMER_CRASH_COUNT:  1
DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT
PROCESS_NAME:  ts3client_win3
CURRENT_IRQL:  0
EXCEPTION_RECORD:  fffff88009dde9d8 -- (.exr 0xfffff88009dde9d8)
ExceptionAddress: fffff800033becd2 (nt!NtDelayExecution+0x000000000000005d)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 0000000000000000
   Parameter[1]: ffffffffffffffff
Attempt to read from address ffffffffffffffff

For test purposes, also uninstall DayZ.

It may just be a coincidence but two of the dumps occurred while one or the other was running. The other dump may be a Nvidia driver but at least it's easier to find the problem if the dumps are consistent. Faulty memory doesnt help either.