Hello Spiritsongs, welcome to the forum of Avast!
When installing Avast! (make sure any other anti-virus is uninstalled and your pc rebooted) you can use the default settings which are offered to you during installation. It's a step-by-step process and, once finished, your pc is protected.
Don't hurry, read each step carefully and it's almost impossible to make mistakes.
As for a choice in protection: AntiVir is excellent, especially in scanning archives, but has no email-scanner and is a pain in the neck when it comes to updates. AVG is very easy to set up but very difficult when it comes to setting up the email-protection.
Avast! is very complete, has fully automatic updates and installs automatically.
As for the detection-rate, there are no big differences between AntiVir and Avast! AVG has a bit of a problem here.
If you want a good protection, good support and ease of use, I think Avast! is a good choice.
God bless you.
Fast
