Nova Chartwheels will install on Windows Vista, unless you have purchased a 64 Bit OS. It will not work on 64 bit Windows XP or Vista, this is a special version available only if you specified it. This is different from 64 bit Hardware which will still run Astrolabe Reports.

If you are having difficulty with running Nova Chartwheels or the installation.
You may get an error "Extended File error or Program Not Registered Contact Astrolabe Support"

All you  need to do is Grant Administrative access,
Right click on the Nova Chartwheels  Icon
Select "Properties"
Click on the "Compatibly" Tab
check "Run program as Administrator"

This will fix the problem.