Probably put the RAM in the wrong slots so your PC is now not recognizing it. Try moving it to other free slots.
This.
0) I'm a certified IT Pro (A+, Network+, and Security+ Certified by CompTIA, MOS and MCSE Certified by Microsoft)
0a) Read this full post before trying anything
1) PC is not ruined - it just needs to be fixed

2) WatchDog has nothing to do with the video game "Watch Dogs" - it's an issue with your hard drive.
3) Kernal Power just means that the computer turned off unexpectedly due to an issue
4) Looks like you have a driver issue with a few things
5) NTFS file error is an issue with your hard drive - a reformat of your hard drive should be fine, do NOT do a quick format, do a full one - Formatting means that all the information on your hard drive will be erased.
6) System Thread and System Service are RAM issues. Read the replies above provided by others on how to fix this.
7) Your PC Specs are within adequate ranges, the most expensive thing is probably the graphics card
8) I see in the picture provided above, that you have 2 free RAM slots on your computer, is that it, or is there more?
8a) If there is only two, try putting one of the RAM sticks into one slot. If that slot doesn't work, try the other one. If this doesnt work, try the other RAM Stick. If that doesn't work, try to blow out the slots and try again. If it works after switching to the other RAM stick, then your RAM stick is bad. You can pick one up on newegg.com (well trusted site for anything IT) for around $25 for a replacement.
9) Cleaning helps, but i heavily doubt it will fix your issues.
10) Your PC will continue to crash due to the BSOD errors as explained above until you get it fixed. From now on, I would say try to refrain from any "heavy" work (games, youtube, etc) on your computer. Only use it if needed, but this is not recommended. The recommended course of action is to get it fixed and to NOT turn it on.
11a) When switching out the RAM it is HIGHLY IMPORTANT that you shutdown your computer safely and unplug it. After this is done, press and hold the power button to drain all power from the motherboard. It is also important that your Ground yourself to prevent shock to the RAM sticks. You can accomplish this by using an ESD Anti-Static Wrist Strap, or by putting your arm across the side of your computer (the metal part) when disconnecting the RAM sticks from the motherboard.
If you have any additional questions, feel free to PM me.