I frequently get an error that says something like "SolidWorks cannot not obtain required memory, please free up memory and press retry or cancel to close SolidWorks."  This always happens at least 20 minutes after my most recent save so it is really frustrating.  Has anybody else run into this issue?  Freeing up memory by closing literally everything else does not help and I always end up losing my work.  Also, here is a screenshot of how much memory SW was using when it failed this last time...is this normal?  The assembly file I was working in at the time is one of our bigger assemblies at 65Mb.

My computer specs:

Windows XP Pro, Service Pack 3

Intel Core2 Duo CPU

2.8 GHz

3.25 GB Ram

Do I need more RAM, better video card, etc...??