The ATI card probably supports TWAIN. If so, there is a TWAIN driver for LabVIEW from ImageMill, located at www.imagemill-tech.com. You probably won't be able to stream video into LabVIEW directly, though...
Another option would be to import an ActiveX control or some other library provided by ATI. If nothing else, there is always the PCI-1411.
Kyle V