Is it possible to encrypt EVERYTHING on ANY computer by using programs that...

[Sean A]

...are built into computers? Making it impossible for people, hackers and programs to cause any
kind of malicious damage to anything on a computer like editing
computer code or deleting operating system files, etc!

[Tender Muffin]

Nothing is impossible for aliens. Encrypt everything and they will still get in.

[john k]

First off, if you encrypt everything it will slow down your computer to almost unusable proportions.
Second, Your computer is only the hardware. Encryption is done with software and nothing like that is included with Windows. Linux and Mac have better security measures built in but that would require learning them (not as hard as you may think).
Even with everything encrypted, someone, somewhere will figure out a way to get in. Plus, you will, at some point, need to have a password which can be figured out.
The short answer to your question is that it is not practical to do so it will likely not be done.