Most people with Windows usually default to the Adobe PDF reader when needing it. I mean, it is the “original” reader.
But if you need a pdf viewer that is lightning quick and a small footprint, then Sumatra PDF fits the bill. In fact, it’s so small that you can install and use it from a USB drive.
That’s right. There is something as simplistic as just reading a pdf without all that other junk and what not. I know they’re called “features” but I really just don’t have a need for it. Do you? So in the case you want something free, for Windows and happens to be open source to boot… take a looksie. You might not be disappointed.