Yes, your absolute right. I would actually do this way, but I just need the information what it caused - anyway. Because Im on way to create a perfect custom-image for friends and me. The VPN-Client need to running. Maybe its really just the DNS-Client and I can fix it for now, so I can do the experiments at anothertime. I do reinstall really often, dont like imaging, cuz i just need few programms/settings and always want them up2date, but thx for the tip. Probably its more complicated (the depending-stuff in windows is... kafkaesk ^^). So I need todo anyway reinstall, but after I sleeped, lol. Feel free people to give tip for the vpn-client-problem, anyway
So dont remove temp files? Nah, I know --- I found a solution: Upgrade. I just upgrade the system from media and all is like i wanted. Kept all stuff and just system overwritten with original files. Ofcs its unclean, i dont like, - but just for this time, its okay for me.