Nearly all your crashes could have been caused by memory corruption. The last crash when playing Warcraft 3 also references you video driver. I attached the bugcheck analysis.
The one thing that can cause errors with both your RAM and video card is bad voltages from an unsufficient power supply.
Test your ram with memtest : download, unzip and burn
memtest86+'s pre-compiled bootable .iso (.zip) using your burning software's burn from image file feature. If in doubt use
ImgBurn (select "write image file to disc" and browse for the memtest .iso file). Leave the CD in the drive, restart the computer, enter the BIOS at startup and set the boot order priority to CD-rom first. Leave memtest run overnight and report if it shows any errors.