Hi Robert,
Are you typing your license key in? If so, you might want to copy and paste (let me know if you're not familiar with the copy and paste operation - many people are, but I try not to make assumptions).
When you copy and paste, please also ensure that you haven't accidentally pasted in a blank space at the beginning or end; this is probably the most common reason that license keys fail. You can help to avoid this by selecting the key from right to left instead of the other way around.
If that fails, could you please try installing the new Online Armor version 3 beta? You can download it from here:
http://www.tallemu.com/downloads.html
Note the two tabs at the top, just under the "Downloads" header. You will want to make sure to click the "Online Armor V3 (Beta Version)" tab.
Let us know how it goes!
Thanks,
-Adrian