There could be a wide number of reasons why this happens. Most common are the following: a firewall improperly configured (it blocks your updater to connect to the update server), no new updates on the server for the product you have and another one would be that you don't have necessary rights to update your software.
To disable the firewall, fire up a CMD prompt using Start menu and type:
netsh firewall set opmode disable to disable the firewall and then check again. To enable it to run the same command, add
enable instead of