Windows 7 Ultimate crashing - ntoskrnl.exe

I enabled driver verifier now and will wait for my computer to crash, I'll post the results as soon as possible, thanks!

here are the latest dump files, I got a BSOD while updating a driver, saying system service exception, and another one when running SF diagnostics tool

Are these currently installed?

Code:

BrFiltLo     Brother USB Mass-Stora Kernel        06/08/2006 21:51:06   
BrFiltUp     Brother USB Mass-Stora Kernel        06/08/2006 21:51:02   
Brserid      Brother MFC Serial Por Kernel        06/08/2006 21:51:11   
BrSerWdm     Brother WDM Serial dri Kernel        06/08/2006 21:51:05   
BrUsbMdm     Brother MFC USB Fax On Kernel        06/08/2006 21:51:00   
BrUsbSer     Brother MFC USB Serial Kernel        09/08/2006 8:11:02 
adp94xx      adp94xx                Kernel        05/12/2008 20:54:42   
adpahci      adpahci                Kernel        01/05/2007 13:30:09   
adpu320      adpu320                Kernel        27/02/2007 21:04:15 
arc          arc                    Kernel        24/05/2007 17:27:55  
ebdrv        Broadcom NetXtreme II  Kernel        31/12/2008 13:29:28 
LSI_FC       LSI_FC                 Kernel        09/12/2008 19:46:09   
SiSRaid2     SiSRaid2               Kernel        24/09/2008 14:28:20  
SiSRaid4     SiSRaid4               Kernel        01/10/2008 17:56:04   
nfrd960      nfrd960                Kernel        06/06/2006 17:11:48   
secdrv       Security Driver        Kernel        13/09/2006 9:18:38

You can reference some HERE

where can I check if those drivers are installed?

I looked in the DV and secdrv is the only one of those drivers that is in the list

I realise I was looking in the wrong place, I have all of those in the System32/drivers folder, except for ebdrv

I got one more BSOD today, here is the file:

Your crashes often showed corruption caused by a solitary bit. Most common cause of this is hardware, and unfortunately there's not really a good solid way to testing which hardware is the problem without swapping out parts. Since you already ran Memtest, we can rule out memory for now. I have a bad feeling it may be the Trio of Trouble: CPU/PSU/Mobo. Single bit flips like what I witnessed here are most commonly caused by a problem with one of these three parts, but they are also the hardest to test, and are nearly impossible without proper testing equipment. Your best bet is to just start swapping parts. I recommend you start with the power supply, then move on to the CPU, then finally the motherboard.

It may be a little for me to test those parts, because I have a laptop, and also, I don't have another CPU or PSU or motherboard to swap them, right now I'm only getting memory related blue screens when trying to scan my portable WD hard drive, any other time, I get driver irql not less or equal, and page fault in nonpaged area

Oh, btw, drive problems can cause this too (not as much as Mobo/PSU/CPU), so don't leave that out. I see you tried the Hitachi test as well as CrystalDiskInfo and they didn't show up with anything. Have you tried Short/SMART tests on Seatools as well? Wouldn't hurt. Still, SSDs still can go on the fritz in ways that software tests cannot detect.