Which Antivirus utility do you currently have installed?
Is this a shared computer?
Are you the Administrator of the computer or somone else?
Could you confirm if this also happens in the default Administrator account?
Open Start
Type: cmd
Right click CMD
Click Run as administrator
At the command prompt, type:
net user administrator /active:yes
Hit Enter
Close command prompt, restart, then try signing into the Administrator account.
Try running the file again.
If this is a shared computer and you do not have Administrator access to install programs, you won't be able to do so.
You will need to ask the Administrator or owner of the computer to sign into their account and permit the installation of the application.