Damn CS-RCS
It turns out that CS-RCS changed my SCC provider to CS-RCS now to restore it i had to execute ssint.exe from vss\win32 folder and i could access source control now. But the episode was really nasty, especially coming from a company that makes configuration management tools. So if any guys from ComponentSoftware are listening, please provide a SCC switcher or atleast restore the previous one on uninstallation.