Hi again, clean install and format wasn't for me (to much work) so a made an in place upgrade of the win7 (eg install win 7 with option to upgrade itself when starting the installation)
and now all is working, most important no errors when starting wideowave and all the other programsin the Roxio suite.
All settings were retained and the only thing were all the updates and the outdated IE, it took 3 hours in total, no need to reinstall any of my applications ans games
Since the re-installation fixed the ntdll-problem, there must be some other way to fix the dll-issue but i haven't found any articles the does it... (i've searched and tried many but none were succesful)
This was my solution to the problem and can be recommended to those of you that got stuck and don't want to make a clean install again!