Driver IRQL Not Less or Equal BSOD followed by Page Fault in Non-Paged

Lately I've been having all the games on my computer crash within about 2-3 minutes of starting them, and sometimes I get a Driver IRQL Not Less or Equal BSOD in place of a crash. I had two of these BSOD's last week, and all of them seem to be followed by a Page Fault in Non-Paged Area BSOD. I've ran Memtest 86+ to make sure there's no fault with my ram, and they cleared 3 passes, and chkdsk shows no errors either. BlueScreenView reports that the Driver IRQL error is associated with a USBPORT.sys driver, and the Page Fault BSOD is associated with a msahci.sys driver.

==================================================
Dump File : 093014-5413-01.dmp
Crash Time : 9/30/2014 6:37:20 PM
Bug Check String : PAGE_FAULT_IN_NONPAGED_AREA
Bug Check Code : 0x00000050
Parameter 1 : ffffc106`c1292a08
Parameter 2 : 00000000`00000000
Parameter 3 : fffff960`001567cd
Parameter 4 : 00000000`00000007
Caused By Driver : msahci.sys
Caused By Address : msahci.sys+4739
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+75bc0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\093014-5413-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 292,616
Dump File Time : 9/30/2014 6:40:56 PM
==================================================

==================================================
Dump File : 093014-5272-01.dmp
Crash Time : 9/30/2014 6:35:11 PM
Bug Check String : DRIVER_IRQL_NOT_LESS_OR_EQUAL
Bug Check Code : 0x000000d1
Parameter 1 : 00000000`0000002b
Parameter 2 : 00000000`00000002
Parameter 3 : 00000000`00000000
Parameter 4 : fffff880`06a273c8
Caused By Driver : USBPORT.SYS
Caused By Address : USBPORT.SYS+153c8
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+75bc0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\093014-5272-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 7601
Dump File Size : 293,056
Dump File Time : 9/30/2014 6:37:12 PM
==================================================

Hi Barman42. :)

As you are having multiple bugchecks with multiple probable causes, the first thing that you should do is to test your RAM modules for possible errors.

How to Test and Diagnose RAM Issues with Memtest86+

Run memtest for at least 8 passes, preferably overnight.

If it start showing errors/red lines, stop testing. A single error is enough to determine that something is going bad there.

Let us know the result.

Good! Let us know for any further BSOD.

Also, if you think that the present issue is solved, please mark it as solved.