Problems

Itunes was unble to load dataclass information from sync services reconnect or try again.

Environment: Windows xp sp3, itunes 8, iphone 2.2

solution

itune 8 was considered to have the virus or Trojan horse behavior, simply turn off your antivirus software the following functions: Trojan acts judged and interception, IE leakproof wall, Trojan download intercept. Then everything work well

This was what works to my situation, hopes it can help you!