didn't find anything, it's not the usual problem of systemwide bold fonts...
More and more pages i read frequently seem to use a font, which my Windows 7 has some trouble with. It looks bold and especially the 'e' doesn't have its hole, as can be seen in the first pic, 2nd is correct on a pad.
This occurs only in browsers. System not affected.
Compatibility view, Cleartype or dpi-settings do not change anything.
Website looks ok on Smartphone and Linux.
solved it myself.
as the faulty font was mostly in <p> tags, it had to be some standard font.
got some tool for chrome that showed, its helvetica that is rendered as default.
kicked helvetica from my disk, as its not win default, reboot, done.