hello, please make sure that your security software isn't interfering with the installation process...

if this doesn't work please also run a scan of your system with the security software already in place and different tools like the free version of malwarebytes, microsoft safety scanner & kaspersky security scan.

I tried downloading the security software, and I can't. It closes on me too. Any ideas?

Try to boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps.

I had the same problem with the same version (19.0) and I did right-click on the installation file, then "Run as Administrator". And it worked!

I'm using windows 7 Home Premium.

For your information, I already have had similar issues with other software and Running as Administrator has fixed the issue many times.

So I guess it's a matter of permissions. I don't understand it, because I'm always connected as Aministrator, so I don't get why I should specify it to "run as as administrator".

Hope it'll work for you too.