random BSOD when playing some games

Please provide all the files following this tutorial so we can provide a complete analysis: Blue Screen of Death Posting Instructions

MSINFO32:
Please go to Start and type in "msinfo32.exe" (without the quotes) and press Enter > Save the report as an .nfo file, then zip up the .nfo file and upload/attach the .zip file with your next post. Also, save a copy as a .txt file and include it also (it's much more difficult to read, but we have greater success in getting the info from it).

systeminfo:
Please open an elevated (Run as administrator) Command Prompt and type (or copy/paste) "systeminfo.exe >%USERPROFILE%\Desktop\systeminfo.txt" (without the quotes) and press Enter. Then navigate to Desktop to retrieve the syteminfo.txt file. If you have difficulties with making this work, please post back. Then zip up the .txt file and upload/attach the .zip file with your next post.

First please tell us how was your copy of windows activated.

Code:

Host Name:                 USER-PC
OS Name:                   Microsoft Windows 7 Ultimate 
OS Version:                6.1.7601 Service Pack 1 Build 7601
OS Manufacturer:           Microsoft Corporation
OS Configuration:          Standalone Workstation
OS Build Type:             Multiprocessor Free
Registered Owner:          user
Registered Organization:   
Product ID:                00426-OEM-8992662-00006
Original Install Date:     26/02/2013, 9:35:53
System Boot Time:          14/09/2013, 11:45:36
System Manufacturer:       System manufacturer
System Model:              System Product Name
System Type:               x64-based PC