Normally, a 220 kbps wmv, won't tax your computer CPU that much.
A video like this can be watched in almost any computer with a CPU higher than Pentium 2. It could actually play in a Pentium 2 depedning on how movement the video it self has.
As a general rule, I wouldn't care much about the computer CPU or RAM until the video code rate goes over 1 Mbps.
