According to that log file either windows is telling calibre your color depth is less than 32 bits or calibre is unable to load the style plugin. I'll add some print statements to clarify which it is in the next calibre release. In the menatime I suggest doing a clean install. Uninstall, delete the calibre installation folder and re-install.
Notice to all: I can not
provide assistance with DRM removal, for legal reasons, so please do not contact me about it.