Multiple BSODs, would love some direction

[quikclik2]

I've had multiple BSOD's over the course of the past couple weeks. Computer is about 2 years old, and has had no problems up until now.

Spec:
CPU - AMD Athlon II X2 250 Regor 3.0ghz
Motherboard - Asus M4A785TD-M EVO
RAM - Crucial 2gb (2x1gb) 240-pin DDR3 SDram 1333
Also added Crucial Ballistix Sport 4gb 240-pin DDR3 Sdram 1333 about 3 months ago. Have since removed and the problem still persists. Have also tried running with just this stick and still, same problem.
GPU - Upgraded to Zotac ZT-60501-10L about 3 months ago. Have since removed it and switched back to on board GPU and the problem still persists
PSU - Using the one that came with this case.....http://www.newegg.com/Product/Product.aspx?Item=N82E16811192089
OS - Windows 7 Ultimate 64-bit (same OS that's been running from the get go)

BSOD seems to present itself mainly when watching and/or streaming video. Ran disk check, and the disk check software from western digital, all came back clean. Ran memtest86+ several times, with all sticks, and each stick by itself, with no errors. I'm at a loss, and would LOVE any help to lead me in the right direction before I chuck it out the window.

 

[Tmagic650]

What antivirus program are you running?

 

[quikclik2]

Avg

 

[Tmagic650]

For test purposes delete AVG and install free Microsoft Security Essentials:
http://windows.microsoft.com/en-us/windows/security-essentials-download
See if your computer stabilizes...

 

[quikclik2]

Ok, I'll take care of that when I get home and report back.

 

[quikclik2]

Uninstalled AVG, installed Security Essentials, made sure I had all windows updates, scanned (nothing found), reboot, and as soon as I hit play on a movie, presented with this BSOD

 

[Tmagic650]

Run a check on the C drive by going to computer. Right-click on the C drive. Select properties, tools, check now. Put a check mark in both boxes to set a disk check on the next start up...
Also, turn off automatic restart by going to Control Panel, System, Advanced System Settings, Advanced, start up and recovery. Uncheck automatically restart

 

[quikclik2]

Automatic restart is off. I did a disk check at restart a couple days ago, but I will give it another shot

 

[Tmagic650]

If automatic restart is off, this may be a power supply issue

 

[quikclik2]

Check disk was fine, double checked and automatic restart is indeed off. Any advice on troubleshoot the power supply? Other than what was in the tutorial for checking in speedfan? I really appreciate your help thus far.

 

[Tmagic650]

Ah yes, that 300 watt PS is not strong enough and it is the cause of all this. Because of the case size, it may be hard to find a power supply over 450 watts that will fit

 

[quikclik2]

Not that I doubt you, but if that's the cause of the problem, why has it worked trouble free for so long?

 

[Tmagic650]

Power supplies weaken over time. Especially the ones like you have installed...

 

[quikclik2]

Makes since. Well I sincerely appreciate all your advice, thanks a lot!

 

[Tmagic650]

You are very welcome