Hi people, nevermind this I solved the problem.
My problem wasn't the MSSQL-server, it was the path variable.
I had previously installed php-support, so know the php.ini was reading from an old location... a map which I had forgotten to erase.(actually I had 2 different paths to 2 different php-folders!)
I guess that the installation program for wamp5, and the application when its started only
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