Memory Card
 

I have a GT3 save game file on my mem card which is corrupted. I cannot save over it and cannot delete it as it states its protected. How can it be removed?

try getting rid of it from within GT3. if that fails, you can try to delete it with the AR2/GS2 or need to format the memcard using an xport/AR2 (sharkport/Gameshark 2) with PC link.