iTunes was unable to load provider data from Sync Services. Reconnect or try again later.

If you're experiencing this problem, "iTunes was unable to load provider data from Sync Services. Reconnect or try again later," perhaps the fix I found will work for you too.

At the time of the error, I was running iTunes 10.4.1.10 on Windows 7 Home Premium, 64bit OS. I had just starting using iTunes again to sync with my iPhone 4. It had been nearly 2 years since I had used it with an iPhone -- the original.

Try these steps to correct the problem:

1. Eject / disconnect your all iTunes devices (iPhones, iPods, etc)
2. Close iTunes
3. Open Task Manager and kill the Sycservices process
4. Rename the "C:\Users\[your user name]\AppData\Roaming\Apple Computer\SyncServices" folder.
   DO NOT delete the folder, because if this doesn't solve it or causes other problems you can always return to this older version of the folder.
5. Restart iTunes
   
6. Re-attach your device

This worked for me. Let me know how it worked for you.