[Rof]

look at your screen, when you are asked where to install, CLICK CHANGE and do the path manually.

your Operating System is installed in drive D:\ which the install wizards thinks that its the DEFAULT DRIVE. so by doing a manual path, you can guide the installer to put the files in drive C:

dont say that the screen say that its in C:\Program Files\Fiesta, coz even if it says that, the wizard will not recognize it if there is NO folder named Program Files\Fiesta on that drive...so yeah.

hope this helps.