Hi wadeywales and welcome... :iagree:
So I'm guessing that you didn't inadvertantly dl platinum or gold by mistake. If you haven't done so, please check as larry suggested.
Be certain your key is saved. Recommend you uninstall fab completely, reboot, run a registry cleaner (as long as you're comfortable in doing this), reboot again and do a new install of express.
If you continue to have problems, you may want to consider a system restore along with the above (assuming you have xp as an os).
Hope this helps.