With Windows Explorer, navigate to your C:\Program Files\Common Files\Apple\Apple Application Support folder.
Copy the libmxl2.dll that you should find there, navigate to the nearby Mobile Device Support folder, and Paste it in there also.
Reboot and see if all is well
In case that your OS is Windows 7 (64 bit)
1. Open windows explorer, go to location C:\Program Files (x86)\Common Files\Apple\Apple Application Support
2. Copy file "libxml2.dll"
3. Open new windows explorer, to to location C:\Program Files (x86)\Common Files\Apple\Mobile Device Support
4. Paste file "libxml2.dll" to the location.
5. Reboot your computer, it should not display that message, it should be clear.
Good Luck