Eset AV sometimes prevents to run and install some applications, for example microtorrent client or virtualbox extension pack. If the AV pausing does not help, there is an option to kill the AV process using a standard way (using the task manager). However, Eset AV has enabled by default a Self-defense feature preventing to do that.

Therefore to be able to kill the process this feature has to be disabled. To do that follow:

• Open ESET (NOD) AV (v6 in my case)
• Press F5 for advanced settings
• Go to Antivirus => HIPS
• Uncheck Enable Self-defense (disable it)

• Restart Computer

After restart we should be ale to kill the ESET process.