Video editor Hangs

We run Lectora Professional Publishing Suite v2007 SP2a (4547) on a Windows XP machine which is fully patched. When trying to run the Video Editor (v2) we run into problems. No matter where the video to be edited is, on a disk or the pc, when we try to open it we either get the message 'Backing Up Video...Please Wait' or just the hourglass comes up and then nothing further happens.Running Task Manger shows the Video Editor Not Responding and the only way out is to end the process.Has anyone else come across this problem and if so, how is it resolved?Thanks.

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