Well, I've fixed up the first part.
Do This Instead:
Set Text Font "Arial" : Set Text Size 50 : Ink Rgb(255,25,0),0
Center Text 320,20,"Welcome To" : Wait 3000 : Cls
Center Text 320,20,"Silent Bill" : Wait 2000 : Cls
Center Text 320,20,"Play P to Play"
Center Text 320,70,"Exit E to exit"
Do
If ScanCode()=25 Then Wait 1000 : Exit
If ScanCode()=18 Then End
Loop
The advantage of this way is that the code looks at lot neater plus when the user has to select either "Play" or "Quit" they don't have to type there answer in and then press enter, all they have to is just press either "P" or "E".
If you were to post all the media I could help you out some more

.