Consecutive blue screens every few months

Ever since i got my computer i have been getting Blue screens. Most oftenly with the code Memory management or more seldomly Kernel Security Check Failure.

What's weird though is that i get a bunch of BSOD's during a day or two and then the computer is fine again for a few months. Now it has started again and i thought maybe i could get this solved with the help of this community.
Programs keep crashing and it sometimes tells me game filers are corrupt during this BSOD period.
I have changed RAM during this so it would be weird if there is a ram issue.