That is indeed strange, Paul... What is your computer model number, and the OS you are using? Is it a stock install, or did a shop or friend set it up for you? I would recommend to not install the game directly in the root folder of C:, but rather make yourself a new folder, such as "C:\Games" or whatever you want to use, and install the game to that. Being directly off the root of the hard drive has the potential to cause issues, though I doubt that is what the case is here.
Also, are you using a disk version of the game, or a download from Ubisoft or Amazon, or similar?