Hi.
Clear your cookies and cache/system cleanup/game doctor in your browser and try again. You could also clear your DNS-cache and the cache of the launcher browser. To clear the DNS-cache, open a command prompt (“Windows” key +”R” key and inside the new window enter "cmd") and type inside the command "ipconfig /flushdns".
Additionally, please update flash to the latest version and make sure that the firewall settings allow for flash player.