Other stuff possible:
1) make sure you run your Windows OS updates...waiting or partially-installed Windows updates are known to cause similar problems. A couple have been issued in the past week. Reboot your PC even if you do not find any.
also try
2) Rt-Click on the installation file, and select "Run as Administrator"
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
