Thanks for the feedback jwinterm. I know that most up-to-date ccminer forks are built with static libraries (so separate dll's are not required), but the cryptonight base from which .....
Working now myagui. Turns out I have cuda5.5, and both versions work, so I guess it was just the missing dll. I'm getting much lower hashrate on that windows computer though, around 250 h/s per 750ti, compared to about 425 h/s per card on ubuntu machine. So, don't know if that's cause I need to update cuda, or just cause windows sucks, but, anyway, it's working now

I have similar deficiencies on certain comps running my 750ti's. Not absolutely positive but I believe it boils down to the architecture of the machine and/or bios. Bios update risk not worth the reward. ...I know this btw because I have swapped 3 different ti's between about 5 different machines and then played musical chairs with them and the deficiencies persisted among the mobo/processor/bios architectures and not the variations in cards or software. ....not likely your fault