Vinyl Windows Are Hard to Raise

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Home was built in 2001 with new construction tilt-in vinyl windows and several of the windows are hard to raise... I didn't see any screws to adjust inside window sash (since they were probably nailed around the flap during construction).  I also have 2 windows that once opened, don't seem to want to stay in place and slide down a little.....

Any suggestions?


Rural Retreat, VA