Hi thanks for the information everyone. Oddly enough cgminer works for my ATI card under the service, but I was unable to get my NVidia card to work for likely the reasons mentioned (although this could be due to the fact they are on different OSs as well...). I will look into the issue, it may be something I can tackle by using some different win32 api calls. I'll post an update within a week or so.
The mining part of cgminer worked for me to, too. It's only the fan/clock-controlling part, that doesn't work. In the posted log it complains about a mismatch between number of fan-controllable devices and overall mining devices.