Hi, I overwrite it with a clean "mlang.dat" of my installed XP, of course after using "makecab", but it's still cannot be found during the text mode of Windows XP installation processus. I hade also a problem with mlang.dll, when i right click on desktop to set properties an error message appears telling me that mlang.dll is not a valide image.... But this one has been fixed using ModifyPE then makecab then overwrite on XP source CD. By the way, ModifyPE didn't worke with me on mlang.dat (modifype mlang.dat -c), it tells me that this file is not a PE file, so I've only executed makecab on mlang.dat . Once the installation finished I copy mlang.dat to "SYSTEM32", but WMP11 cannot read music files, RealPlayer does, WMP11 can only play ".wav" files . These problems occured after I slipstreamed WMP11 in my uptodated XP source CD using "WMP11 Slipstreamer" . Please advice.