Pickledeggs3000

I'm running Windows XP Windows Media Center (a 32bit os) and wish to install my copy of Sid Meier's Civilization IV. I have done this a few times before and wish to install again (it is currently not on my XP due to me uninstalling it). However, on instering the disk, the autorun does not autorun, and when trying to open any file on the disk, or by double clicking on the disk in My Computer (which trys to make the disk's autorun start) , a pop-up comes up telling me that "E:\" or (eg.) "E:\Setup.exe" "is not a valid Win32 Application". I know it IS a vaild Win32 app. What can I do to install and be able to run the game? :confused: Thankyou in advance for any help, Pickledeggs3000