First off, i have an ati video card, so if your issue is with your nvidia card there is help in the link i'm going to point you to, but i didn't have to try that out.
When i would run pe8 on windows 7 64 the display wouldn't work at all, and the program was so slow it was painful. i found this link on the forum, and followed the instructions, and everything worked. i didn't even have to replace the old files, because they didn't exist on my computer. i don't know if that's an installation thing with win 7, but the files weren't there. I tried to install twice and neither time did they show up, so i think the only problem for me was the dlls were missing. make sure you follow the instructions all the way, and the link to the new dlls is kind of hidden at the bottom of the page, so make sure you look for it. anyway, i hope this works as well for you as it did for me!
Thanks for reporting, and glad that you got it working.
Just for grins I tried the dll thing on a Vista 32 bit system with no joy.