Go to Start -> Run:
Type RegEdit

Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion

On the right side is something called: ProgramFilesDir

*Write down the current path of the ProgramFilesDir, you'll need to change it back after install*

Change this value to a drive that contains 7+ gigs of space

Install Dreamfall

*Go back into the Registry, to ProgramFilesDir, and change it's value back to what it originally was.*

Don’t mess up your registry by doing anything else.