So, it really turned out, that this was the problem. Actually I was having difficulties just with the updates, the other addons worked fine. When I tried to integrate some manually added hotfixes and a hotfix addon, all updates were still showing up in Windows Update, although the process had completed with no errors in nLite. Separate integration of hotfixes and hotfix-addons did solve it. Basically I tried two methods and they both worked: 1. hotfix integration first and then the addons 2. the other way around Further to this, one could create, let's call it a basic nLite-ed copy of XP first, with all tweaks, unattended, etc. (no hotfixes, addons) already applied, and then integrate anything. It just spares some time. If somethings goes wrong, you just take the basic copy and start over. I was using XP Pro, SP3 already integrated, and wanted to update it and integrate 2 addons Directx9 August 08 and .NET (these I downloaded from ryanVM's forum, but don't know anymore where exactly they were) For the hotfixes you could use a couple of methods: 1. http://www.ryanvm.net/forum/viewtopic.php?t=5687 Onepiece addon 2. http://unattended.msfn.org/unattended.xp/view/web/5/ 3. Or what I personally prefer. I installed a fresh copy (no updates integrated) on my virtual machine, went to Windows Update to see which updates I was missing, and then downloaded them all manually. Hope someone could use this info.