C
CyberTaz
Go to the Apple Downloads site, retrieve & apply the 10.5.5 Combo Update
then repair disk permissions & see if that doesn't put things right.
http://support.apple.com/downloads/Mac_OS_X_10-5-5_Combo_Update
then repair disk permissions & see if that doesn't put things right.
http://support.apple.com/downloads/Mac_OS_X_10-5-5_Combo_Update