I have the 64 bit version that I use but the 32 bit is installed also. It has been that way since the 64 bit was released.
What is AV? Yeah blame it on my gray hair
If I uninstall will I delete all my books and metadata I have for the books? Yeah I do not know about this so I had rather ask than do something to mess up and no longer have my books. Yes books are backed up but I really do not want to download then all again.