Go to your Uplay installation folder and find libcef.dll and Uplay.exe
One at a time, right click on them and select Properties
Select the Details tab
Take note of the File Version numbers and post them in this thread.
After doing that, may also wish to try re-installing Uplay by downloading the installer HERE.
You do not need to uninstall Uplay to do this. Instead you can simply install the latest version over the top of your existing installation which will retain all of your settings, saves and game files.
Before doing so, make sure that Uplay is not running in the background to ensure that all files are properly overwritten.