Turn off the User Account Control:
  1. Go to Start > Control Panel > User Accounts > Change User Account settings.
  2. Slide the bar to the lowest value to turn off the control.
  3. Click OK and restart the workstation.
Or

As an alternative to turning off the User Account Control:
  1. In Internet Explorer, go to Security
  2. Click Trusted Sites > Sites
  3. Add the following to Trusted Sites: https://*.Blackbaudhosting.com and https://*.Blackbaudondemand.com  
  4. Then click on the Advanced tab
  5. Mark the Do Not Save Encrypted Pages to disk, unmark Enable native XMLHTTP support; click Apply, but not OK
  6. Unmark the Do Not Save Encrypted Pages to disk checkbox, mark Enable native XMLHTTP support; click OK, but not Apply
  7. Close and reopen Internet Explorer