Hello stxmuser,
Your first question that mentions the examples do not work with LV 7.0 would probably suggest the examples were written in LV 7.1 and would therefore not work in an older version. Loading them in LV 8.0 should continue to work fine.
LV searches specific folders such as vi.lib, which is where the IMAQ create and IMAQ dispose VIs should be located. If you are browsing your file system you should find them in ...\LabVIEW 8.0\vi.lib\Basic.llb\specific VI. You probably won't be able to search your hard drive for the VIs since they are wrapped in a .llb and therefore aren't recognized by Windows as individual files.
I would suggest downloading versions 3.5.1 of the IMAQ drivers available
here for Windows. That should add those VIs and also add the specific palettes in LV as well. When LV is searching for the specific VIs it should tell you the name of the file that it is looking for. If this doesn't work please include a list of the VIs that LV cannot find.
Travis Marsh
NI Florida