Why won’t that program run? Is it your antivirus? 

If there are two types of software that annoy you by hogging your computer's CPU and slowing things to a standstill they are probably the sync tool for your cloud storage and your antivirus. These are both useful so we put up with their greed, but one very irritating thing about antivirus software is that it can prevent perfectly legitimate programs from running without even telling you. So if you install an application and it doesn't work as expected or if your antivirus is updated and strange things start happening try switching if off or adding affected applications to the whitelist (also called exceptions or exclusions) of applications the antivirus will allow to run.