Help with dropbox

Up to a few days ago I had dropbox working well on my desktop but suddenly it stopped being able to connect.
I uninstalled it and now I can't install it again because apparently it thinks I'm connected to the internet via a proxy.

I know nothing about this and I didn't chage any settings so I thought it best to ask for help. When installing I get a Connection Error - If your computer connects to the Internet through a proxy server, please specify your setting here.

Then my options are " Reconnect Now " that does nothing and " Connection Options... " that opens a window with proxy settings. If I click auto-detect it gives the same error.

Is it possible that something changed the settings ? How do I check if I have a proxy or not and if yes, how do I turn it off ?

I already tried turning off the anti virus and created an exception on the firewall. Using Windows 7. Thanks !

Go to Internet Explorer, Internet Options, Connections tab, LAN settings button. Uncheck all of the boxes assuming you're on an always-on Internet connection like cable or DSL. I've seen malware change these settings and many other programs use these, even if you're not using Internet Explorer yourself.

Thank you so much Mike ! That solved it ! Thanks

Dang, good job mike_d, well played!