Thank for the advices, though I have some more question I would like to ask hope you don’t mind.

  1. After the reboot there are 2 avast shortcut on the desktop, when I tried to delete the older shortcut from the recycle bin it says it is still in use, so, I click cancel to not delete and refresh the recycle bin. However, the shortcut is gone, is that counted as nomalies?

  2. is the uninstall untility for all version of avast (e.g can version 4.8 use it as well)

  3. this is unrelated to the topic but just something I have wondered for a long time. For a newly bought PC is it possible for it to be attack by malware just by connecting to the internet? Not surfing or doing anything else.