Dropbox error "no internet connection"

After installing dropbox in Windwos7 64bit i got the error "no internet connection" even my internet was working very well.

I got understand that there is some proxy issue with my internet connetion. This problem generally occurs due to installation of bogus softwares.

I adopted following workflow and issue of "no internet connection was resolved and dropbox worked well.
1. start windows default "internet explorer"
2.Tools> internet options
3. Connection Tab> LAN Settings
4. Under proxy Server, uncheck "Use a proxy server for your lane"
5. Click ok, Ok. exit your internet explorer.
Now try your dropbox, it will work. InshAllah