As far as I know you can use the evaluation version of winzip virtually forever... *shhhh* don't tell anyone, but even our corporate version that I use 3-10 times daily is evaluation version too.

As far as using winzip, it might look scary with the funny little icons but like most windows based programs is fairly user friendly.
-Click on the "New" icon
-give the file a name and save it in your desired location
-find your multimedia file
-make sure the compression is set to maximum
-then click add

and if you don't already have winzip, you can get it at www.winzip.com