Cannot create C:\inetpub\wwwroot\flexviewers Error

Good day,

I am trying to install Viewer for Flex but am running into problems.

I have downloaded Adobe Air and have turned on the Windows IIS on my laptop.
I am the only user and administrator.

When the Application Builder opens for the first time the Settings window pops up and when saving the default location for Web
Server Base Folder and Base Folder URL, I get the following error: Cannot create C:\inetpub\wwwroot\flexviewers!

What could prevent me from creating the Web Server Base Folders?

Any help would be greatly appreciated.

Thanks in advance,

Erik