You may well have fixed this error by now, but here's an easy fix.
With Windows Explorer, navigate to your C:\Program Files\Common Files\Apple\Apple Application Support folder.
Copy the libxml.dll that you should find there, navigate to the nearby Mobile Device Support folder, and Paste it in there also.
Restart the programme all should be well
In case that your OS is (64 bit)
1. Open windows explorer, go to location C:\Program Files (x86)\Common Files\Apple\Apple Application Support
2. Copy file "libxml.dll"
3. Now paste it in the folder C:\Program Files (x86)\Common Files\Apple\Mobile Device Support
4. Restart the programme, it should not display that message, it should be clear.