Itunes cannot connect to dataclass sync services?

I'm having the same problems.

I've updated and backed up my old original iPhone, plugged the iPhone 3G in, i get the same error message, then the iphone appears on the left but nothing happens!

All i can do is eject it from the options, wont let me sync or do anything and doesnt give me any other options.

I've tried re-installing itunes, stop and started Apple Mobile Device Helper but nothing seems to work.

Very Very frustrating!!

Has anyone found a resolution to this problem yet??

Still get the iTunes error message 'iTunes was unable to load dataclass information from sync services. Reconnect or try again later.'

Anyone know what this means??

Many Thanks

I just spent an hour on the phone with support (1-800-my-iphone). I have Vista

This is what we did, step by step, and i'll include the things we did that finally worked, wasn't supposed to fix it, but it did.

Run MSCONFIG (System Config Utility)

Under the General Tab, select Selective Startup. Make sure the ONLY checkmark is in the box for Load System Services

Click on the Services tab. Check the box for Hide All Microsoft Services. The click the Disable All button.

Click the Startup Tab, and disable all there as well.

Restart your computer.

-----The following is from an email support sent me to follow.-----

Then once you are back up, do the following...

1. Use the Programs and Features control panel to uninstall iTunes, Apple Mobile Device Support, and QuickTime.
2. Download iTunes from http://www.apple.com/itunes/download
3. Find the iTunesSetup.exe file and move it to the root level of the hard drive (C:\).
4. From the Start menu, choose All Programs, then Accessories, then right-click Command Prompt and choose Run as administrator from the shortcut menu.
5. At the prompt, type the following (WITH the quotes): "C:\iTunesSetup.exe"
6. The iTunes installer should launch. Run through it as they would normally.
7. Relaunch Itunes and sync the Iphone.



That was the fix for me. Iphone is now syncing with Itunes with no issues and no error messages.

Then go back an renable startup programs and services as needed in MSCONFIG.

This fixed my issues. Hopefully it will help others as well.

Otherwise, you'll probably spend an hour on the phone with support trying other things.

hi, From a Person Like me Who has a squeeky clean computer with no spyware, adware, or viruses...........i had this problem and the fix above did it^ and it also fixes any problems regarding AppleMobileDeviceHelper.exe ..... like if it keeps multiplying and slowing down your computer like what happened 2 me.... but honestly itunes should not have been released with bugs like these in the first place !!!!!.. ok! apple!!! ..........lets hope it doesnt happen again or i might just strangle one of the GENIUSES in the apple support who couldnt fix this!!

I had the same conversation with Apple support and arrived at the same fix. However, between system boots, I wind up back with the same problem. After each boot, I can run CMD as administrator, type "c:\itunessetup.exe", and then perform a Restore. Then I am able to sync fine with errors. I have sent this result to Apple Support Services along with log files. Hopefully, they can now figure this problem out.