Microsoft Works Calendar - please help

Hi,

I just got a Dell Inspiron 1564 with Windows 7. I've tried using Calendar in Microsoft works but it doesnt start, and an error message comes up (picture below). 

I'm pretty sure i have not tampered with the software. The problem is i don't think I have a CD for Works, i only have the Windows 7 cd and drivers cd that came with the laptop.

Please help as I would like to use this feature!

Thanks!