Games are crashing and I'm getting random BSODs

[FreeTheEnslaved]

Ok so I have a problem which is starting to really annoy me because I have no idea why it is happening. Basically, for the last couple of weeks, some of my games have been randomly crashing and I'm getting the Blue Screen of Death once or twice a day, with random codes. Here are my specs:

NVIDIA GeForce GTX 650 Ti OC 1GB
Intel Pentium G620 Dual-Core Sandy Bridge CPU
Gigabyte GA-P67A-D3-B3 SKT-1155 Motherboard
WD 2.5 Inch 500GB SATA Internal HDD
8GB RAM (4GB Kingston ValueRAM & 4GB Zeppelin RAM)
Windows 7 Home Premium 64-Bit

The problem started about a week after I installed the second RAM stick so I don't know if that has anything to do with it. So far, I can remember getting these STOP codes:

0x0000001A
0x0000007E
0x00000019
0x0000003B
0x00000005

Thanks in advance for any information or help.

 

[AMD Radeon]

have you taken the suspicious ram off?

 

[FreeTheEnslaved]

have you taken the suspicious ram off?

If by that you mean have I taken the suspicious RAM out then no. The crashes and STOP errors don't happen often enough for me to want to test that but if no other solutions come up I'll give it a shot.