In place of antivirus? Or do you need both?

You see, I have two laptops. Between the two laptops, one has a virus protection whereas the other one doesn’t. I no longer have the McAfee’s (Antivirus) CD in my possession. So, Is it possible to send a Virus Protection program from one computer to another? If so, how?

Thanks a lot guys!

I first had avast antivirus but it said it was out of date and needed an update, so i tried to update it but it wouldn’t work.

So i downloaded avg(the free version) and my windows secruity thing pops up and says "your virus protection is out of date" RIGHT AFTER I DOWNLOADED IT.
>:l

How do i fix this?

This has happened before but it was always related to software. I have put no new software on. I have done a diagnostic and it says everything is ok. This is a Dell Inspiron 9300. My anti virus says no viruses and my spysweeper says no spyware. I did get a message a couple of days ago from my antivirus that said it had quarrantined something that could possibly be a virus. I deleted it and scans since then come up clear. I am also getting a message from my fire wall that says something about ICMP Echo Request (‘Ping’) from (IP addy) and it’s blocking it. Any ideas?
I use avg antivirus, spysweeper, and zone alarm firewall.

He has a lot of nonsense on his laptop and i have already installed a pestpatrol and an antivirus and ran them both so i have all pests and viruses off. how do i clean up his desktop from all the icons and make it look and run like a well maintained computer??