BSOD = ntoskrnl.exe...apparently???

hi guys, im an extreme noob and need your help bad!!!! I have been getting major BSOD and i dont have a clue what to do. Im running Vista Ultimate 64. Every crash seems to concern ntoskrnl ( will but details later).

I have changed my RAM, graphics card, HDD, done a clean install 3 times... im at my witts end. Ive updated drivers , memtest the works. Anyway heres the bluescreenview opinion (last 5 crashes):

==================================================
Dump File : Mini040712-02.dmp
Crash Time : 07/04/2012 02:37:02
Bug Check String : SYSTEM_SERVICE_EXCEPTION
Bug Check Code : 0x0000003b
Parameter 1 : 00000000`c0000005
Parameter 2 : fffff800`0298e3a0
Parameter 3 : fffffa60`05ddb090
Parameter 4 : 00000000`00000000
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+5a4d0
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+5a4d0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\Mini040712-02.dmp
Processors Count : 4
Major Version : 15
Minor Version : 6002
Dump File Size : 291,256
==================================================

==================================================
Dump File : Mini040712-01.dmp
Crash Time : 07/04/2012 02:19:30
Bug Check String : IRQL_NOT_LESS_OR_EQUAL
Bug Check Code : 0x0000000a
Parameter 1 : 0000000f`5ddaa6f4
Parameter 2 : 00000000`0000000d
Parameter 3 : 00000000`00000000
Parameter 4 : fffff800`02966b9f
Caused By Driver : nvlddmkm.sys
Caused By Address : nvlddmkm.sys+255155
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+5a4d0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\Mini040712-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 6002
Dump File Size : 291,280
==================================================

==================================================
Dump File : Mini040612-03.dmp
Crash Time : 06/04/2012 03:28:39
Bug Check String : BUGCODE_USB_DRIVER
Bug Check Code : 0x000000fe
Parameter 1 : 00000000`00000005
Parameter 2 : fffffa80`079e71a0
Parameter 3 : 00000000`10024396
Parameter 4 : fffffa80`0a660238
Caused By Driver : USBPORT.SYS
Caused By Address : USBPORT.SYS+38335
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+5a4d0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\Mini040612-03.dmp
Processors Count : 4
Major Version : 15
Minor Version : 6002
Dump File Size : 354,368
==================================================

==================================================
Dump File : Mini040612-02.dmp
Crash Time : 06/04/2012 02:10:23
Bug Check String : BUGCODE_USB_DRIVER
Bug Check Code : 0x000000fe
Parameter 1 : 00000000`00000005
Parameter 2 : fffffa80`08bad1a0
Parameter 3 : 00000000`10024396
Parameter 4 : fffffa80`09f56238
Caused By Driver : USBPORT.SYS
Caused By Address : USBPORT.SYS+38335
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+5a4d0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\Mini040612-02.dmp
Processors Count : 4
Major Version : 15
Minor Version : 6002
Dump File Size : 360,184
==================================================

==================================================
Dump File : Mini040612-01.dmp
Crash Time : 06/04/2012 01:46:42
Bug Check String : SYSTEM_SERVICE_EXCEPTION
Bug Check Code : 0x0000003b
Parameter 1 : 00000000`c0000096
Parameter 2 : fffff800`0267699f
Parameter 3 : fffffa60`0ef17260
Parameter 4 : 00000000`00000000
Caused By Driver : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+5a4d0
File Description :
Product Name :
Company :
File Version :
Processor : x64
Crash Address : ntoskrnl.exe+5a4d0
Stack Address 1 :
Stack Address 2 :
Stack Address 3 :
Computer Name :
Full Path : C:\Windows\Minidump\Mini040612-01.dmp
Processors Count : 4
Major Version : 15
Minor Version : 6002
Dump File Size : 291,376
==================================================

Please help a desperate guy.

Thanks

Chris

We'll need this info to get a good look at the system: http://www.vistax64.com/crashes-debugging/282419-blue-screen-death-bsod-posting-instructions.html

You've had 5 BSOD's over a short period. I presume that there were none of significance immediately prior to this.
That means that it's either something that you installed/changed recently - or a hardware problem.

In this case there are 3 different BSOD error codes - so, IMO, this is starting to point at a hardware problem.
Hardware problems consist of:
- hardware being broken
- overclocking
- incompatible drivers
- low-level driver problems
- malware.

The info that I requested will help us to rule out a lot of the possibilities - and that'll let us focus on what's wrong.

Once you post the info and are waiting for our reply, please run Driver Verifier according to these directions: Driver Verifier Settings