You have a hardware problem which must be addressed. Run a test of your RAM with memtest86+. Some of your OS files might also be corrupt. Do a fresh Windows OS install, if need be.
The first thing to try is to remove and reinstall the memory. The memory can be damaged by static electric discharge, and you must also be careful with the clips that hold it in place, as they are often made of plastic and can break easily if pushed too far.
To deal with static electricity, sit down, don't slide around, and always touch a metal part of the computer case before touching any components. There are various other precautions you can take, but those are the main ones.
You can search and find explanations for how to remove and replace memory if it doesn't look too obvious for you.
If, after removing and reinstalling the memory, you still have the memory parity error, then you have more work to do. First, if you have two memory modules, you should try removing one or the other and see if the computer works fine with only one. This will help you determine which module is defective.
Second, you may wish to purchase or otherwise acquire replacement memory.
Test your RAM. A common culprit in system crashes is a bad stick of RAM. When RAM fails, it causes the system to become unstable. Open the box unplug it from the Slot Remove the RAM clean it for carbon and dust particles and plug it back on make sure when you plug it back you hear the click sound.
Test your hard drive. Run the “chkdsk” function on your hard drive to scan for errors and fix potential problems. A failing hard drive can cause Blue Screens due to corrupted files. To run chkdsk, open command prompt and type CHKDSK entre.