My solution now was to use revo uninstaller to remove really all Steam and NS2 files and registry entries. After reinstalling steam and NS2all is working
in NS2 Won't StartComment by michael390May 2014
Yes i checked all things.
But now I have a workaround.
I installed revo uninstaller, and uninstalled NS2 and Steam in strongest uninstall mode and deleted really all (all directories, all registry entries and so on) .
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Same here , first I thought windows updates were the problem (IE fix update and so on). But after deleting the updates and an earlier system snapshot is the problem allready here...