deleting your preferences.
Goto the Finder in the dock, wait for the window to open. Go to the button that has a House.
Goto Library, Then Preferences.
Now find any files that say "com.apple.Print." and delete them.
eg: com.apple.Print.PrintCenter
com.apple.Print.Presets
Now close that window.
Goto the Finder again in the dock, now goto the button which says "Applications"
Goto the Utilities Folder, then find the program called "Disk Utility".
Double click on that program, now select your hard drive in the left side, and there should be 1 partition, select it.
Now goto the tab that says "disk first aid."
and press "Repair Disk Permissions."
Go ahead and wait for this to be done, may take 2-15 minutes.
Now close everything down, and re open the print center.
Now try to add the printer.
Else, call the manufactorer of your printer.