I'm having trouble with my graphics so I'm thinking of updating my computer
Welcome to the forum. I'm happy with mine (hover your cursor on my name for the specs), but what will work best for you will probably depend on what you'll be doing with SolidWorks.
Best OS? I'd go with Windows10 Pro. Now, if you're asking what the best setup is, you'll get a ton of different responses. I use a Dell tower & Microsoft Surface Pro 3 at work. At home, I have a Dell M4300 laptop. All work well.
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