Trash empty problem?

[P Trouchet]

Greetings all Own stupidity problem.>
    Help please I somehow downloaded my total backup on to my main 
disc. (G4 Imac on OSX 3.1.7).
 & I now can't trash as each Applic Duplication is locked. Tried 
Picture 1 icon method , Change administrator. No joy. My disc is now 
giving full up signals & running out of space cos I cant empty Trash?? 
Any suggestions please. Make allowances for what appears to be 
galloping senility! Thanks & Ciao > b.