Computer BSODs frequently

[Nippe]

So.. Everything begun when I decided to upgrade my computer to match nowadays games like Starcraft 2 which was lagging way too much in some cases..

First of all I bought a new graphic card, power supply and screen. (When I started playing games I noticed my computer makes some nasty screeing voice while playing?) After a few weeks my computer just died and wouldnt start up, found out my motherboard/CPU died.

So I went back to shop and bought new motherboard, new processor, new CPU, 4GB of RAM (later another 4GB too making it total 8GB) and new operating system (OEM Windows 7 Pro x64 , old one was vista 32 , formated both hard disks before installation).

After a day with new software/hardware my computer started BSOD:ing in like everything I did (opening folders, installing stuff), mostly "PFN_LIST_CORRUPT" or "MEMORY MANAGEMENT" as reasons.

I ran all kinds of memtests/hard drive tests with no negative results so I decided to open up computer and watch if I pulgged something wrong and found out there were second power cable slot capped in motherboard -.- When I plugged second cable to it my computer could do everything just fine before a new problem arise.

Half of times when I start up my computer it works fine for about 5 minutes and then programs stop responding and are unable to start leading to "Explorer.exe doesn't respond". If I try to restart explorer, computer BSOD:s with reason "SYSTEM_SERVICE_EXCEPTION". If I shut down my computer immediatedly after first program stops responding, it will shut down normally.
After I restart my computer it works just normally without any problems!

I have checked my drivers with like 3 different driver programs and downloaded latest ones I could find (except intel chipset drivers). Also programs wont start crashing if computer survives first 5 minutes or so.

So I'm asking what to do with these BSOD:s (and whats wrong with voices my computer makes while playing, is it normal?)

 

[yowanvista]

Remove Avast and replace it by MSE
Memory corruption is also the cause, one or more RAM modules may be damaged, test each module individually

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


BugCheck 3B, {c0000005, fffff880056335de, fffff88007c6fd60, 0}

Probably caused by : aswMonFlt.sys ( aswMonFlt+25de )

BugCheck 4E, {2, 79015, 21ffff, 1}

Probably caused by : memory_corruption ( nt!MiUnlinkPageFromLockedList+8e )

Followup: MachineOwner

 

[Nippe]

Thanks for fast answer! Replaced Avast with MSE, I'll post back if I meet more BlueScreens.