i need help badly

I want to get my original xbox dashboard but i can't get to my current dashboard that i installed(it was either UnleshX or EvoX)and every time i try to get to the dashboard a screen with Words in a bunch of different languages comes up and it has the number 21 in the top left corner. How do i get rid of this and get the original dashboard back

 

ok u go to the game u dowloaded unleashed dash, example, splinter cell and u go to linux and press install ms back up. but u do realize u have to softmod ur box again after u do this.......ur welcome

 

no its not install ms dash its somten else but i forget its somten ms/////cant remember

 

i will try that

 

my bro wuz tryin 2 fix it and he screwd it up and he deleted the linux file for splinter cell and the messed up dashboard wont let me put the file back into the hard drive so basicly my xbox will only play normal games and not let me go on live a again