Hmm.. press CTRL+ALT+DELETE, task manager, processes and then look for HGWC.exe, click on it, then click on end process, delete the folder "Z8games" and start windows again in safe mode.
<--how to start in safe mode, press f8 just right before the splash screen
and then choose Safe Mode with Networking Prompts
And then go to CF website, download, re-install..
Then try again

hope this helps
Press Thanks if i helped :P good luck