It is our pleasure to provide this software free of charge to help you in your ministry. We're so thankful for our partners who make this possible!
A good first step is to uninstall/remove any previous version of DonorWise. If you can't uninstall DonorWise, use the "Windows Installer Cleanup Utility" to remove DonorWise from the Add/Remove Programs list.
After DonorWise is uninstalled, try installing the latest version of DonorWise: http://www.tntware.com/donorwise/downloads/
If you have an error, please send a screenshot. Or better yet, click "Advanced" and then "Log this Installation" (and send back the log file produced):