Do you see the launcher login/update window or it's invisible? In case of you can't see launcher window you can fix it this way: Download this package: http://www.microsoft.com/en-us/download/details.aspx?id=8109 Then run it, extract to accessible directory. Open this directory, find and run "DXSETUP.exe" installer. After installation finished try to run launcher once again.
I just found this post on another thread! Thanks for posting here, you rock! I will update this thread if i have success.