Problem installing Yuri's Revenge on Windows 7

[Obsdark]

¡Hi to all!

I'm trying to install RA2 Expansion (Yuri's Revenge) on Windows 7 but when i press the button to install it, it apparead a message "Authentication failed, please install red alert 2"

Any Suggestions, Ideas, or even better... Solutions?
All is gonna be welcome

Since Now gratef truly gratefull


-Obsdark-

[Obsdark]

¡Hey oh!

I'm Having a problem installing Yuri's Revenge, its result than after i press the button "install" the game send me a message "Authentication failed, please install red alert 2 first"

And i don't have any trouble playing RA2 Without the expansion, also i have it updated to 1.006

Somebody think what can be the trouble?

gratefull a lot Since now
Honestly


-Obsdark-