Hope someone can help me with this problem. I just bought an older home and most of the windows don't open. I have tried a few things already. It looks like they are either painted shut or the wood may have expanded. Some of the windows look tight in the frame.

I have tried:
1. Cutting the paint with a knife (actually a pizza cutter worked good)
2. Tapping a putty knife along the edges, top and bottom
3. Tapping a wood block along the frame

So far the windows have not moved.

Thanks for the help.