ITunes 10.7(21) 64-bit keeps prompt for Unable to load data class information from sync services

I have just installed the xcode before I resync with iTunes.
I got this problem after sync with iTunes. 
My mac running 10.8.2 and latest iTunes 10.7 (21) 64bit.  I tried some advices from web but I have no luck:
1. Use sudo to remove the iTunes and resinstall it but it didn't fix the problem.
2. Use Timemachine to restore the AppleMobilexxx.kext and it also didn't fix the problem.
3. I tried to delete all backup ~/Library/Application Support/MobileSync/Backup/, no luck too.
4. I tried to reset the syncservices folder too http://support.apple.com/kb/TS1627
What else can I do now?
Regards,
Jimmy

After an entire day of searching for a solution, I finally resolved my problem.
To be honest, I tried so many things in such a random order, I'm not sure if every step is necessary but these were my actions.
I disabled ESET anitvirus (I believe that it was ESET that caused the probelem in the first place).
I created a rule to allow the following .exe file to work
C:\Program Files (x86)\Common Files\Apple\Mobile Device Support\com.apple.Outlook.client.exe
I'm not sure if that is enough to fix the problem because I also did the following.
Uninstalled & reinstalled iTunes
Whilst ESET was disabled, I ran every .exe file in the folder:
C:\Program Files (x86)\Common Files\Apple\Mobile Device Support
Initially, I had to run the com.apple.Outlook.client.exe file every time I opened iTunes & then something made it stick.  Not sure what.  Maybe I had disabled ESET in the meantime.
Anyway, I hope this helps someone out there.

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