[flexcoders] IE 7 not showing my flex app

[Guillermo Villasana Cardoza]

Hello, I have a problem with ie 7 and flex, IE7 keeps telling me that 
flash is not installed, I was told that I had to specify size of my app. 
But the problem is that even though I specify size, it still shows me 
that flash is not installed. How can I solve this?
Thanks