Scientific Linux uses the yum
package manager. I don't use it (pacman
is what Arch Linux runs), but the command should be similar to this (use bash-completion if it isn't):
sudo yum install vlc
Chrome can be downloaded from Google, but Chromium should be in the repository:
sudo yum install chromium
For a paint alternative, I suggest GIMP. It's more like Photoshop, but it can function like paint:
sudo yum install gimp
Virtualbox should be the same way:
sudo yum install virtualbox
Do note, though, that Scientific Linux might not come with any repositories enabled. Google is your friend, though: http://scientificlinuxforum.org/index.php?showtopic=229