iTunes + Quicktime Issue

I just recently have been getting my Powerbook G4 back up and running after a HD failure. I updated the software on my computer that was replaced by TimeMachine. Now I am getting an error from iTunes stating I need Quicktime 7.5.5 to run iTunes. I have Quicktime 7.3, and I had it check for updates and it says my computer is up to date. Does anyone know why I am now getting this error?

QuickTime X is the new "default" QuickTime engine, but 7.6.4 for Tiger is still available right here:

QuickTime 7.6.4 for Tiger

If you're running Leopard, you can use QuickTime 7.7:
QuickTime 7.7 for Leopard