LookupAccountName fails on vista with ERROR_NONE_MAPPED

I'm trying to cal开发者_StackOverflowl LookupAccountName on Vista - it always fails with the error ERROR_NONE_MAPPED.

What could be the reason??

Thanks!!

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ERROR_NONE_MAPPED typeically means that the username you provided is not available in the format you specified.

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Try disabling UAC on the your machine. It should work after that.