Hello everybody, After a long time without slipstreaming I had to do it and encountered the annoying "nHelper not found" error ( that's not as rare as many would like or say it is ) . Researching a little bit I think I have found where is nLite doing the wrong stuff that leads to the error. Looking inside the compressend nLite.INF file, in the \I386 folder of the slipstreamed windows, I've found the following: HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce","nlite_post_s03",0x00020000,"nhelper delete ""%10%\SET3.TMP""" HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce","nlite_post_s04",0x00020000,"nhelper delete ""%17%\INFCACHE.1""" HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce","nlite_post_s07",0x00020000,"nhelper delete ""%11%\nhelper.exe""" HKU,".DEFAULT\Software\Microsoft\Windows\CurrentVersion\RunOnce","_nltide_3",0x00020000,"rundll32 advpack.dll,LaunchINFSectionEx nLite.inf,C,,4,N" HKU,".DEFAULT\Software\Microsoft\Windows\CurrentVersion\RunOnce","_nltide_2",0x00000000,"regsvr32 /s /n /i:U shell32" HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce","nlite_post_s05",0x00020000,"nhelper moveex ""%17%\syssbck.dll"" ""%11%\syssetup.dll""" HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce","nlite_post_s06",0x00020000,"nhelper moveex ""%17%\syssbck.inf"" ""%17%\syssetup.inf""" HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce","nlite_post_00",0x00020000,"nhelper rd /q /s """"%SystemRoot%\eHome""""" HKLM,"SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce","nlite_post_01",0x00020000,"nhelper rd /q /s """"%SystemRoot%\System32\ime""""" ( This is, of course, just an excerpt, there's a lot more lines ) If we take a look at the third line, we'll see that nhelper.exe IT'S DELETING ITSELF ! That's probably because of a previous slipstreaming. nLite seems to be doing some housekeeping, i.e., on the first slipstreaming, when it has done all it is supposed to do and is no longer needed, it "takes out the trash", deleting everithing that it's taking out space without reason, including itself, which is good programming practice after all. The buggy behaviour comes when you do another slipstreaming over the first and this second ( or third or whatever ) needs nhelper.exe to more stuff, like removing components or setting up unattended options. It includes more lines referencing the program but it will not be there anymore ! Patching the file, by removing the line or moving it to the end corrects the problem. To do that you must extract the nlite.inf file from the nlite.in_ file, using any normal compression program ( i've tried 7-Zip, WinRaR and IZArc and they all have worked ), edit the file and re-compress it and that last it's the annoying part: you''l have to do it with the M$ old-timer, console based compress.exe ( at least I couldn't manage to do it in any other way ) and, OF COURSE, put it back where it belongs: the \i386 folder of your slipstreamed windows. Doing that everytime you slipstream will be a huge annoyance so let's hope it gets fixed. Bye