[Brush is Pixilated, How Can I Make it More Smooth?]

I've been using Paint.Net for awhile now but one thing has always bugged me about the program. The line art that I create either with the Line/Curve tool or the Brush is always pixilated. Unless I make my images absolutely massive, the lines always seem pixilated. I was wondering if there was an option to where I could make the lines I make a bit more smooth? Less blocky?

[Paint.Net won't open or Reinstall please help]

Hello,

First off allow me to better describe my problem. Recently as of 7/8/2020 Microsoft updated my computer that unfortunately wiped out all of my images I made with Paint.NET and I believe it wiped out Paint.Net as well however not fully. When I place Paint.Net on my taskbar and attempt to open it, the icon vanishes and the application refuses to run. I open Task Manager to ensure it isn't running in the background and it isn't. So I go into the settings for Paint.NET and there it says that it is taking up no storage on my computer. So I go to the Microsoft store and attempt to reinstall the program however, whenever I click Reinstall/Open nothing happens.

I find it curious as to why only files I made with Paint.Net have been deleted and why my computer still thinks Paint.Net is still installed. Any help would be valued and I thank anyone who is willing.