We received a new laptop for Christmas. Neither my husband nor I are tech savy. What kind of software(anti-virus, etc.) should we install before using the computer? It came with a free trial of Norton's, but that has expired. A friend helped us install CCleaner. I think we have the free version of AVG on our desktop. Would AVG be suitable for our new laptop? If so, do we need to uninstall Norton's? Thanks in advance for any help.