Can't install Games from CD due to user control in Windows Guest mode

Hi,


I have windows 7 installed under Parallels on my Macbook Pro.

When I attempt to install a game from a CD. For example Morrowind from a CD I get the following messages:

Window pops up:
Title: User Account Control
Do you want to allow the following program from an unknown publisher to make changes to this computer?
Program name:Setup.exe
Verified publisher: Unkown
File origin: CD/DVD
Program location: "D:\setup.exe"

To contiune, type an administrator password, and then click yes.

The Yes button is grayed out.

So even if I knew the password I could not enter it.

How can I get around this to install my game?

Will I just have to remove this installation of Windows and reinstall in a custom mode which allows me to access Admin features?

REgards,
Bobs