Mac Pb G4 won't go past grey screen

sume25

Registered
Hi there
I recently installed avast antivirus and after run deleted some infected files, mac power book cannot boot. It goes into the apple screen and the little circle keeps spinning and then doesn't do anything after that. I don’t have installed cd. I have tried repairing disk permissions, and none of them work. How to rerun Setup to create another Administrator account?
I'm so frustrated with it. Can someone please help me with it?
 
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