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In the client loader, when you click tools, there is a repair option, I think you should try and repair the install and see if that gets you anywhere. If that doesn't work we can try something else.
re-installed it several times too.
if i use the link from the verification-mail i got, there is a problem accuring with the visual c+++ - something.
made me to restart my computer, but still got a problem with that.
if i use the setup-link at the homepage, the installation is fine. no problems with it.
edit:
updating frameworks and the visual c ++ stuff hasnt helped