Video rotation software.
 

I was at a gig last night and I was using the digital camera to take pictures and record some footage. Me being not the sharpest knife in the drawer, the single piece of footage that I did record was done vertically, so now I have a strained neck from viewing that through my computer. Can someone recommend me a program so I can rotate a video (.avi format) at right angles?

Try Adobe Premiere

Any other software someone can recommend? Something I can download for free and is easy to use?

Maybe VirtualDub can do such a thing, I'm not sure though.
It's a free program though, you can download it from here: www.virtualdub.org