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I have a PRO subscription not a business edition. The file was already present on my system but with line <UseKextless>-1</UseKextless> Changed it...
Glad I found this thread. Setting "<UseKextless>0</UseKextless>" did the trick for me as well. Unbelievable that Parallels has not fixed this bug...
To speed up av encoding with a multicore aware app under Windows XP, I've setup a Windows XP SP3 VM in Parallels 6 with all available cores...