[Resettozero]

I never had to unless making some major changes from the default Ubuntu menu interface.

That was it. I tried installing BitDefender Free and realized that Zorin 8.1 is still not a good-enough replacement for XP to suit many of the XP users I deal with. That was the first program I tried to install and figured it would be difficult (for XP users) to install some other (non-standard) programs in the future.

[TexasRepublic]

I Googled BitDefender Free — it is a Windows anti-virus program. Why would you try to install that on a Linux system?

I have used Linux on multiple machines for at least 4 years, have never installed any kind a/v software on Linux, and never had the slightest hint of malware or viruses.

As long as you install approved Linux programs from the Linux Repositories, you should have no problem installing them - at least, I never have.

[Utilizer]

I tried installing BitDefender Free...

That is a Windows (TM) program. It will run under Linux about as well as it would under a Mac or OS/2 Operating system -in other words; it will not. Linux does not need windows or dos programs to run. That is the same as saying that you tried to install MS Office in your Linux machine but it won't work. More to the point, bitdefender is not necessary on a Linux machine.