Tried installing Calibre but when it's almost complete installer gives the message "rolling back action" and the installation can't complete. I tried disabling my antivirus but still it happens? what could be the problem?
found the solution from another forum:
"I was having the same problem. I spent several hours troubleshooting and finally figured out the problem was in adding the desktop shortcut. I then tried the install, disabling the shortcuts, and it worked. Hopefully this helps anyone else with this install/upgrade issue."