1. Disconnect your iPhone/iPod touch from the computer
  2. In Vista Programs and Features (Control Panel), Uninstall the Apple Mobile Device Support
  3. Restart your computer
  4. Download the iTunes 7.7 installer
  5. Open the iTunes 7.7 installation exe with Winzip or WinRAR, and reinstall only the AppleMobileDeviceSupport.MSI
  6. Reboot your system
  7. Reconnect your iPhone/iPod touch

Thanks iPhone Atlas