Window won't stay up

A home owner from Edinburg va says:
We have two windows that won't stay open we have to prop them up with wood what can I do to fix them
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Paul from SWISCO responded:
It sounds like a problem with the balance system. A balance is a type of spring mechanism located on either side of the window sash that keeps it up when it's raised. If you were to take a few pictures of your balance so that we can identify the type, we can go further and try to recommend an exact replacement. Thanks!
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