Directions to Download and Install
Go to the website www.getpaint.net Make sure you type in www.getpaint.net with no spaces.
On the right side of the screen click Paint.NET v3.10.
A new screen will now appear.
Click on the down arrow to scroll down the screen.
When you scroll down you are looking for the green download
button. It looks like this.
Click the green DOWNLOAD NOW! button.
You will go to a new screen.
Click download now.
After this point you are going to click "Run from this location," or "Open."
The download will take you to a Microsoft Website to download and install another program. This is needed so that Paint.NET will work.
At the Microsoft web page you will click the following link.
"Download x86 versions" 
Click Accept or Ok to any prompts that are given to you. This is a simple program with nothing to be afraid of.