BSOD, multiple errors, possibly failing hardware

Hello.
Recently I've been having quite a few BSOD aswell as a number of freezes. The BSOD's happen seemingly random and I think they've been primarily 'd1' and 'a' errors. I'm hoping there'll be a log of past BSOD's in the diagnostics tool file. The freezes only ever happen when I'm using a web browser and started occuring about a week ago. Most of the time the computer stutters one or two times and then freezes up followed by a restart 10-20 seconds later. The few times it has managed to recover the resource monitor shows that something called 'system interrupts' have had a sizeable cpu spike.

I've also noticed that my network connection tends to just die a few hours after I start the computer.

As I've gotten BSOD's I've been updating or rolling back drivers that were implied but at this point I'm more suspecting a hardware problem than software. I should note that leaving prime 95 on over the night didn't spit out any errors.

Any help pinpointing the problem(s) would be very appreciated.

Edit: I just used a program called bluescreenview and it appears atleast 5 or so reports were missing. 2 days ago (or so) there were a bluescreen and the computer failed to start and startup repair decided to do a rollback.

Here's my system specs: (I think)

Motherboard: Gigabyte GA-P35-DS3L

Graphics card: gtx 560 (ASUS)

Harddrive: Seagate baracuda 3gb

RAM (x2): 4GB 800MHz DDR2 Non-ECC CL6 DIMM (Kit of 2)
Standard 256M X 64 Non-ECC 800MHz 240-pin Unbuffered DIMM

PSU: corsair VX 550W

Harddrive failed and got replaced 9(ish) months ago. Ram died and got replaced about 18 months ago and graphics card sometime before that I think. Cpu and motherboard should be about 5 years of age but I may have replaced the PSU at some point aswell. :P

I'll take a look at that tutorial a bit later today, ty.

Hello again and sorry it took so long time to get back. A couple of hours ago I replaced my PSU with a new one and it turns out my PSU was innocent.