OK !! thought i'd report back as i finally found the cause of this XXX problem..
I have some Divx codec and a file by the name divxdec.ax was called everytime i opened an explorer window that contains media files coded with Divx4 (or other Divx releases), so i renamed this crapy file and the problem did not come back..
I uninstalled the Divx codec / reboot / re-install credible codec and living happily ever after