I honestly thought I used vlite to slipstream SP2 into Vista... It was ages ago I did it, but apparently it's possible to do it not using vlite: http://www.ryanvm.net/forum/viewtopic.php?t=7222 http://www.vistax64.com/tutorials/230249-sliptream-vista-sp2.html Not sure why this thread has been moved to the vlite forum though, it's not all about vlite but how to integrate .net into Vista! I know what you mean about integrating patches that are released since the service pack, but if you try and do that in vlite, sometimes the patches fail to install. It was the same with nlite. Whenever I rebuild my XP disk, I do it from a clean source. That only takes around 20 mins or so to do though. Creating a new build in vlite takes much much longer, but, as I say, if you try and integrate a couple or so patches, vlite fails to install them. Still not sure how to integrate .net 4 into Vista having a further read around. I can't seem to find a way to download an msu or cab file. I am still looking. I'll report back if and when I get it sorted. Thanks again for your help. Oh, and great find with the "back and restore activation" app, that could be really handy when I am rebuilding stuff offline.