Infrequent BSODs PFN_list_corrupt (4e)

hi ive been getting a BSOD(obviously from title) and only have the two latest dmp files(which was a couple of days ago evn though iv'e been using the pc) one states
PFN_LIST_CORRUPT (4e)...
BUGCHECK_STR 0X4E_99...
DEFAULT_BUCKET_ID: VISTA DRIVER FAULT...
PROCCESSOR_NAME: PRQSTARTER...
the second is...
MEMORY_MANAGEMENT (1a)
BUGCHECK_STR 0x1a_403
DEFAULT_BUCKET_ID: VISTA DRIVER FAULT...
PROCCESSOR_NAME: DWM.EXE

now after some research i found that it either has to do with the the video ram or ram itself either driver corruptions or hardware failures. I need some one to specificaly diagnose my issues and lead me to a fix please.i have copies of the dmp files if needed. i would greatly appreciate it thanx in advance
 
PFN_LIST_CORRUPT & MEMORY_MANAGEMENT bugchecks usually mean that there may be some issues with System RAM or RAM settings / voltage.

What is your system's complete specs?

Can you please zip five latest minidumps in a single file and attach it with your next post? You can find minidumps in C:\windows\minidump.

In the meanwhile, I'd suggest you to run memtest for at least 10-12 passes on 'each RAM module' individually and see what it says.
 
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