three different bluescreen errors

Hello everyone,
This is my firs time posting something here. I have tried some other forum in order to find a solution or solutionS to my problems.

I installed my sql server 2013 and immidiately after the installation my computer's fan started to stay on more and my RAM was occupied more (about 25%) (I have 12 GB of RAM on my pc). Then the random crashes started. Crashes happened even when I was only working on Google chrome or Internet Explorer.

I googled a little bit and found out that something happens and memory starts to fill with scripts and it just adds up and it causes crashes. So I started task manager and ended the proccess of "mysql" and "sqlwriter" which gave me a little more time before a crash.

So I decided to reinstall windows. I reinstalled windows 7 Home Premium and the problem still exists. I have gotten three different blue screens. Here are links to photos I have taken from my screen:

https://dl.dropboxusercontent.com/u/...603_195020.jpg
https://dl.dropboxusercontent.com/u/...603_023340.jpg
https://dl.dropboxusercontent.com/u/...602_204018.JPG

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INFO:
DELL XPS 9100 Desktop model. Windows 7 Home Premium x64 (ORIGINAL! lol)
12 GB of RAM, ATI READON HD 5800 series
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What I did: I googled all those errors and found two hotfix files from microsoft support website and installed them. Nothing happened, meaning, it didnt help at all.

Also I have installed CCleaner and tried to fix registry which didnt help either.

could you please help me out?

Thanks,

Kaveh.