FS like hangs...

Hello,I am having a strange problem, probably its something regarding to my videocard. Anyways, when I switch to full screen mode and then in full screen want to open the FS menus, I have to first click ALT key to see them. I click ALT, I can see the menu nicely but I have to wait like 5 secs until I can surf around there, for 5 secs after ALT pressing FS is like hanged and nothing can be done. Then I set whatever I want via menus, for example go to Display and then press ok, again, hangs for 5 secs and then I can continue flying. It also happens when opening FSNavigator or closing it. What could it be?? It was also with my old computer that had this same videocard in. Though I havent heard others having this issue.Looking forward to your answers! It would help me a lot! Thanks!