Occasional BSOD - probably caused by RAM or driver

Recently I've been getting BSOD occasionally on my HP CQ40-401AU laptop. Most of the time it occurs when I play games (mostly Dota 2) or watch video (embedded in web browser), but sometimes even when I just browse the webs, do some simple tasks or even when the computer is idle (just some tasks in background, e.g. downloading). Some periods of time BSOD occurs quite regularly (about 2-3 times/day) but some periods of time it doesn't occur at all.

The STOP codes are mostly 1A, 1E, and 3B... so I guess RAM or some driver is the root of problem. I'm using 2 RAM modules, 1 Micron 1GB and 1 Transcend 2GB, so their incompability may be the problem, but BSOD hasn't occur a long time after I installed the second RAM (must be 1 year at least). I have tried to reinstall Windows several times but it did not resolve the BSOD.

My computer specs:
- Laptop HP Compaq CQ40-401AU
- OS: Windows 7 Professional 64bit
- RAM: 3GB (1GB Micron + 2GB Transcend as described above)
- Graphics: ATI Radeon HD 3200 Graphics
I have attached my minidump files and computer's information. Please help me resolve this BSOD issue. I will provide you any further information if you need it.

Thanks in advance!

Sorry, this is maybe a little out of topic but I have received a notice like this:

Attention: Big Q

Before posting a BSOD thread, please read the instructions here: Blue Screen of Death (BSOD) Posting Instructions

If you need to add new information like the dump files, please make a new post in your initial BSOD thread. Please do not make an extra new thread.

I don't know why I received this but this is my initial BSOD thread not an "extra new thread". Can somebody tell me if I did anything wrong?

By the way, I've just got 2 other BSODs yesterday, code C2 and 0A. I attached them here. Can you help me solve this? Thanks a lot!

Anthony said:

The fist one is correct!!

Thank you for replying but I'm sorry I don't understand what you mean when you say "first one"? Did you mean RAM is the problem? Can you tell me more detail, and give me some advice about what I should do now?

No problem, thanks! Can somebody help me solve my BSOD?