you could also consider installing Ubuntu. This is a Linux operating system. There is no issue with this op it is free. It operates with icons or as we call them launchers. You do have to make a cd or dvd depending on how large the download is. This op system also installs all the drivers needed automatically. If you need help you can get plenty of help at this site
You register and then you can ask any question you have.
To download the op you go here
you have to use an ISO writer to write it to the cd or dvd. If you don't have an ISO writer go to google and put in free ISO writer. If you have win 7 it has one.
Hope this helps you.
Just some information. I've been using this system since about 1997 and have no problems with it when I had a problem I just reboot and it goes away. Oh yea since you are going to use it on a laptop I found that it's better to use an external mouse.
Also as far as viruses are concerned it doesn't typically get viruses.