Windows Server 2008 R2 uninstall method permission denied

Hello,

first of all thank you very much for such a useful extension! The installation process works fine, but I receive an error during the uninstall process.
I am running the script having administration rights and every file except for the "nodejswrapperforsolr.exe" file is removed. I also do not know if it is caused by the error, but the actual windows service also remains in the list of all windows services. I believe, that it has something to do with my operating system (Windows Server 2008 R2), because only the executable file stays untouched and causes the permission error.

Thank you in advice,
vrugaiti