Viking Window is stuck

A quick learner from San Francisco, CA says:
Hi, We have a Viking window with 29" Series 395 Channel Balances that we can't get to open. Do you have any suggestions for getting it open short of using a Sawzall and sledge hammer?
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Paul from SWISCO responded:
Thanks for posting! First, I have to just make sure. Are the window locks activated? You'd be surprised how often this is the culprit. If not, check the top sash guides and see if they're broken. This can often be the problem, as well. See the video below for clarification.
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