Use VAGCOM_EEWriteLang.exe executable which is located in the kolimer's archive.
Flash English language.
Use the loader provided in the same package too (I'd suggest doing a clean reinstall of the software to be sure). Be sure to use the VCDS Original installer (not the one from the Panda CD) - links to it can be found somewhere in this thread.
If after doing the above steps you still face the same problem - report back.
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