ETA2: The problem was not with my winnt.sif - Evidently Nlite is not able to handle integrating XP SP3 under Win2k, and the only indication of a problem is that the updated source will throw these file missing errors after install completes. I created a slipstream inside a VPC running XP and it worked correctly. Edited to add: Have now tried a virgin copy of XP SP2 with no updates and no alterations except for the winnt.sif file - still got the error. This makes no !@# sense. I've rolled back to virtualpc 2004 and am trying it again. If that doesn't fix this problem, my next recourse is to try it without an unattended file and see what happens then. @#$%^&*! Arrgh! I've been getting the framedyn/srclient not found error. I've been paring back the things I've added/changed from the base install in an effort to figure out what is causing it, to no avail. Latest attempt: I told nlite to integrate SP3 into a clean copy of XP Pro SP2, then dropped my winnt.sif into i386 and told nlite to make an ISO. I did NOT use any of the other options - no tweaks, no reducing, no switchless installers, nothing. Installing from ISO under virtualPC 2007 on a computer running windows 2000, I got the dreaded Framedyn/srclient error. Google tells me that this error was cropping up a lot a few years ago, but mostly for people using RyanVM or doing other complicated stuff. I haven't done any of that - the only thing I can think of that's causing it is either a) trying to do the slipstream for XP on a computer running windows 2000, or B) using virtualpc 2007 instead of an older version (up until now VPC2007 has run fine for me, but you have to hack the installer to get it to run under win2k). Was the source of this !@#$% annoying issue ever found? Is there a fix? Attaching my session.ini file and my winnt.sif Last Session.ini winnt.sif