Windows 7 multi crashes

Hey guys about at my wits end here, i recently remade my home PC with new HDD, mother board, ram, processor the whole deal and installed windows 7 professional i got free from my school, but something is wrong and im pretty sure its not hardware, whenever i play call of duty or any high demand graphics games it will crash at a random time and BSOD, and i mean completely random i've been able to play for 2 hours then leave it on lobby and come back for another but then it'll crash after 2 mins another time, i've asked friends geek squad and another forum and they said it was a driver issue, which makes sense because it only crashes when i play high demand games until this...

Problem signature:
Problem Event Name: APPCRASH
Application Name: Explorer.EXE
Application Version: 6.1.7600.16404
Application Timestamp: 4a765771
Fault Module Name: StackHash_024f
Fault Module Version: 6.1.7600.16385
Fault Module Timestamp: 4a5be02b
Exception Code: c0000374
Exception Offset: 00000000000c6cd2
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 1033
Additional Information 1: 024f
Additional Information 2: 024f5b9d9c15cb0f24baccc87b72fd4a
Additional Information 3: ee3e
Additional Information 4: ee3e8b8852df1d52fd25993eb242fe3d

Read our privacy statement online:
Windows 7 Privacy Highlights - Microsoft Windows

If the online privacy statement is not available, please read our privacy statement offline:
C:\Windows\system32\en-US\erofflps.txt

... happened, what it is, windows explorer randomly crashes for no apparent reason, resets and works fine for several minutes then will crash again, in fact it has once already while typing this out, i mean wtf? I'm pretty good at fixing stuff on my PC when it was XP but i have no idea why explorer.exe would crash? Also it sometimes pops up something about the driver failing for my graphics card but immediately goes away before i can copy it down. Any suggestions? Can provide pics via phone of the BSODs but says... "SCSIPORT.SYS" which no one uses scusi anymore, and page fault in unsuspected area. Any help is greatly appreciated

Update: BSOD- "DRIVER_IRQL_NOT_LESS_OR_EQUAL" and explorer.exe - Application error, "The instruction at 0x77be202d referenced memory at 0x05d39448. The memory could not be read. both back to back not 30 minutes ago, currently using Asus express gate web browser, someone please help :/

Start with this:

H/W Diagnostics:
Please start by running these bootable hardware diagnostics:
Memory Diagnostics (read the details at the link)
HD Diagnostic (read the details at the link)

Also, please run one of these free, independent online malware scans to ensure that your current protection hasn't been compromised: Malware (read the details at the link)

Then run this free video card stress test: FurMark: Graphics Card Stability and Stress Test, OpenGL Benchmark and GPU Temperature | oZone3D.Net

Then, please provide this info:

Upload Dump Files:
Please go to C:\Windows\Minidump and zip up the contents of the folder. Then upload/attach the .zip file with your next post.
Left click on the first minidump file.
Hold down the "Shift" key and left click on the last minidump file.
Right click on the blue highlighted area and select "Send to"
Select "Compressed (zipped) folder" and note where the folder is saved.
Upload that .zip file with your next post.

If you have issues with "Access Denied" errors, try copying the files to your desktop and zipping them up from there. If it still won't let you zip them up, post back for further advice.

If you don't have anything in that folder, please check in C:\Windows for a file named MEMORY.DMP. If you find it, zip it up and upload it to a free file hosting service - then post the link to it.
Then, follow the directions here to set your system for Minidumps (much smaller than the MEMORY.DMP file): Set MiniDump