you both forgot something extremely important - there's a good chance that your previous drivers are still installed on your system. especially if you upgraded from an nvidia fx, 6-series, 7-series, older (g80) 8-series, or any ati card. the g92 8-series of nvidia cards - aka, the pci express 2.0 cards - use the same drivers as the lower-end g94-based 9-series, last time i checked. when i installed my 7-series card in escariot's computer (along with a new mobo) i forgot to tell him to uninstall all drivers and reinstall them - he had massive purple blips all over the screen (it was a problem with the black rendering on his, i think). he fooled with the card till he broke the fan, and then said it was a heat issue. check that you're fully seated, but i think it's a driver issue.
the issues could be related to a bugfix that was release between your current drivers and those old ones, thus rendering it as a solid pixel rather than one shaded properly. the issue (since it was a manga you're talking about) is likely related to some specific shade of red, blue, or green.
that post had a lot of info on it, so here's the basics. uninstall all graphics drivers (c:/nvidia, just uninstall everything there no matter what it is or how new or old it is) and then reinstall the 180.24 (i think) drivers, whatever's the newest for the 9-series of cards. there's a beta out, 180.86, that might fix issues as well, but i'd suggest trying the released 180 drivers first.