Well 44% RAM fill is fine- if it doesn't go up too much- naturally the more programs and processes you have going the higher it gets. There is a neat little free program called "Freemeter" that continually monitors important things like RAM, CPU and PF. You can download it at http://www.tiler.com/freemeter
. I like to monitor my stuff- especially the CPU continually. Whenever the CPU is busy for no good reason I go looking for why. It's a good way to find trojans and spyware and such.
A PF of 288 MB seems rather low to me. There is some rule of thumb based on the RAM-size for setting the PF but I frankly don't remember it now (I'm old you know) but probably the best thing is to make it automatic- If you click "change" you'll see a screen that says something like "system managed". Click that if it isn't clicked. Then windows will set it automatic. It will probably make it bigger than necessary but better to have too much than too little.
I thought of one more thing- since you think this is video-related- what resolution are you using? Unless you are using a LCD screen you can try dropping to a lower resolution which greatly reduces the demand on the video driver. Come to think of it, if you are using any flat-screen monitor it could be you need to update the video driver.
And finally there's always the possibility this is a HD problem- bad sectors or corrupted files can cause all sorts of weird problems.