Mac Osx Desktop Deleting Wavs, Cant delete Wavs from the Desktop! Options

[Badmadlad]

I wonder if you can help. G4 450 512 MB OSX 10.2 Cubase SE

I loaded up loads of wavs and copied them on to the desktop . Then I dragged and dropped them on to the Keyboard User interface of Halion. and saved loads of different samples as a Bank of instruments

Now I cant send these desktop files to the trash it wont delete them , says i do not have user access.

So now I have deleted these banks but it still will not let me get rid of the individual WAVS, even to put them in a folder of any sorts. Ive got hundreds of them on the desk top!!!

Any ideas,?