Found this on another thread and it worked for me, syncing as we text to my ipod
Step #1) Go to Apple download and update your Quick time to 7.7 (do not update anything else cuz you can't)
Step #2) Go to control panel, add/remove programs, and click on "apple application support", click change, and repair. Do same to apple mobile devise support, click change and repair, then to apple software update, click change and click repair.
Step #3) Push Ctrl, Alt & Delete to see if your "bonjour" service is running. If not you have to turn it on by going to control panel, Admin tools, then services.
Step #4) Now you can click on "itunessetup.exe" file that you downloaded. If you haven't you need to download.
Step #5) Now it will install without any problems.
Step #6) To sync with your iphone you MUST restart your computer.