Edius 4.5 demo version

[Sal`]

i just installed the edius 4.5 demo version and i added a .wmv clip just to try it out. but when i click on play, the video runs fine and the audio jumps. does anyone know why?
i have a pentium IV 2.0Ghz with 512MB of RAM running windows xp pro sp2.

[STORMDAVE]

The computers too slow for WMV playback on the timeline.

Or just check the properties to see what audio format the file is using. List it here to see if it might help