I'm new here, and I have few questions about security:
I heard that prior any software installation it is recommended to disable all running programs running in the background (including Antivirus), in order to install programs, games, and drivers successfully, without mistakes. But some people says that it's optional. So, for example, if i'm installing software (like Skype, which downloads Setup Files directly from internet) or updating software via built-in updater, it is safe to install/update software when antivirus protection is temporarily disabled (I mean, can any malware enter into my PC from internet in this way, during software installation/update process)? Or it is just a myth ... ? I noticed that many programs, games recommends temporarily to turn off antivirus protection during the installation process (in documentations)...
... And a second question: can I run Avast Antivirus together with Windows Defender at the same time? I always run them both, but friend said that I need to turn off Windows Defender, because there can be issues running them both.
Thanks in advance (and sorry for my poor English).