What happens when I delete files and folders?

Could you try right clicking the Dropbox folder and clicking Properties to see the 'Size on disk' for the folder?

OK now when I right click I no longer have an option to choose between online only or view offline, why would this have gone away? It was there yesterday and was able to do it to some folders.

Nothing changed in that regard. I got a ext HD backup, and the folders that I made online only I then copied to the HD, and then deleted them, and I still have access when I log in and I can see them in the drop box.

But now, when I right click a folder in Explorer, that option no longer shows up. How do I get that back?

Could you try reinstalling the Dropbox desktop application using this link, while ensuring that you use admin privileges to do so.

OK but one question first, it says to uninstall the app I have now first, that won't delete any files will it?

You don't need to uninstall the app, you can just reinstall over the current version, to repair any issues with context menu items. 

After that's done, reboot the machine and let me know if the menu items appear.

the install keeps failing

What error are you getting during the installation? A screenshot would help to determine what's happening.

a little box comes up and says installing dropbox, and it has a green bar that goes from left to right, and then after a few minutes the box says unable to install, and then this web page appears 

https://www.dropbox.com/launch_desktop_app?_camp=15288&_tk=prompt_modal&view=sync_everything_onboarding

I can again and same thing happens

Yes, this much has been discussed, the problem is my inability to mark files as online only