A few months ago my kitten walked across my Mac keyboard & half my applications stopped responding, they bounce in the dock like they are about to open, then stop. There is no warning or message. Can I fix this? Or do I half to reinstall Tiger and start over? My Firefox, Limewire, MSOffice, Dashboard, etc. work fine, but iTunes, Safari, & a few other Tiger apps. just won't open. I'm looking for an expert opinion, thank you for your time.