Im going to do a video review of 2 members play at 2p2, My question is How do I record over there session on camtasia?

Do I just open there Wmf files "Full screen it" and record my screen?

You can actually import the session into Camtasia and edit it there just my Importing Media Files

You can remove the sounds from the vid if necessary by using the "Replace Audio with Silence" option and then just record your own narration as normal.

I do this randomly with UFO Enemy Unknown vids I record from DOSBox....ridiculously addictive game.

If you do this, you have make sure you turn off the "hardware acceleration" of your monitor. This is really important. You can find where to turn that off by right clicking your desktop and it's in the advance properties.

I've just tried it, but here it works without turning hw acceleration off.