Demo file won't even open due to "File System Error"

I'd appreciate some help if possible.

I've downloaded the FM10 Gold / Strawberry version demo, and when I simply double click on the file to open it to install the game, my desktop just sort of freezes. It then comes up with an error message of "File System Error" and some numbers then follow.

My mate has had the same problem too.

I'm using Vista by the way.

Thanks in advance for any help.

P.S - Sorry if this is in the wrong section!