Dual monitor problem

Hello,

I have dual monitors right, i clicked on "Start" Then "Controll Panel" Then "Display" then "Change my display settings" ok now, there is 3 windows in this tab, My current 2 Monitors, and then another window displaying a generic non pnp monitor, i accidentally clicked and dragged that one into the middle of my 2 monitors on the tab and clicked "make this my main display" Then i had no start bar or anything just 2 monitors with backgrounds, no icons or nothing at all, so i restarted my computer, now there are 2 blank screens that i can not click on anything at all it is just 2 backlit monitors i have tried clicking everywhere right and left, Pressed almost every key on my keyboard, nothing has happend, i can hear the Windows 7 start up noise but can not see the startup screen to log in. i need help please! how do i get a functioning screen!