For a good reading experience on the pc, you first need to find a pc reader software, preferably one that has a library management. To help you choose one or more, take a look at: Best ebook reader software for pc. You can use if you have the ebooks in .pdf or .rtf format, software already installed on the pc like Adobe Reader or Microsoft Word.
To make the experience of reading a book on the screen of the computer you need to make the reading as comfortable as possible for your eyes.
Zenith Z-19, photo by Ajmexio