As BRINK pointed out, the
SFC /Scannow command worked like a charm again on this error.
Seems to be related to themes that are installed on various ways. this has happened 2 times for me lately with 2 different themes. Dark VS and Shine 2.0, both downloaded from Deviant Art. I'm wondering if anyone else has this problem? or if it's something gone wrong with my system. But as i said: the restore to standard Aero theme solved the whole bit.
And I'm more than happy to say that i actually can live with Microsoft's design and colors as long as i can tweak some underlying settings found written here on Sevenforums.com