iTunes needs to reinstall, missing component, files are missing etc.

I recently have gotten the updates for iTunes 10.2.1 and I recieved the message upon opening iTunes after the update that: iTunes cannot run because some of its required files are missing. Please reinstall iTunes. This is not the first time this has happened either last update the same occured. The way I fixed it the first time was by uninstalling all the apple files/programs (bonjour, itunes, quicktime, etc.) and then reinstalling iTunes. This fixed the issue. I am wondering if there is an easier way to fix this issue because uninstalling all the components takes time, when I feel there is an easier solution.
Thanks!