KDE cannot execute the games and the screensaver...

[ABroz@t-online.de (ente)]

Hello,
yes I wanna play with Linux. After installing the KDE I tried the games which 
are especially in the KDE packages. But when I start some games I get the 
message "Cannot execute <programname>". What is it ? Must I install one more 
package ? Where can I see what I must install too? 
 Apropos no executing ... my sreensaver doesn't seem to work. I elected (Yes, I 
must write the past-tense of choose but it doesn't comes into my mind now) the 
screensaver "Laser" (wooahh) after 1 minute but when I came into my room after 
the dinner their wasn't any sreensaver?

Thank you for help
Alexander

mail from germany