I\'m really fond of this idea of using Ctrl-V (Ctrl-Q in windows) to modify a visual block. The technique is explained here: In
It may be as simple as not having the right package installed. Visual block mode is not included in vim-minimal which is often the default version of vi. If you do this:
rpm -qa | grep vim
and you see vim-minimal but not vim-enhanced, then you have to install vim-enhanced. That will get you visual block mode as well as many other additional features.