In the next few day I'll repeat my test in VM with 1.7.9D without the replace folder workaround (I need a cd ready for a real install, so that was the fast way). The hotfix list I use is the almost same (I've no checked every single hotfix, but only that are related to winmedia), of course using italian hotfix. Also, I use basic DX9 cab and not the full redist, but I think that is not relevant. Pheraphs is not relevant, but I use winxp as OS, and the file in HF folder are sorted in different way that in 2000 environment: here's the sorted list that windows explorer show me. WindowsMedia6-KB925398-v2-x86-ITA.exe WindowsMedia9-KB936782-x86-ITA.exe WindowsMedia64-KB954600-x86-ITA.exe In a Win2000 environment, the file are sorted exactly as your list. Maybe is that the cause? In my next test I'll try to follow every step of the script.