Hi there Jairul,
This seems to be more of a Dropbox problem, but I'll refer you to the corresponding thread to your problem: https://www.dropboxforum.com/t5/Dropbox-installs-integrations/See-the-logfile-c-Program-Files-x86-Dropbox-client-Dropbox-exe/td-p/218219
In summary, the solution to your problem is that you need to download the Dropbox installer again and reinstall Dropbox, after that you should be fine, if not, you should seek help at the Dropbox forum.
Hope this helps,
Sincerely,
O.