Canipe :
I have an old Dell dimension 8250 computer running Ubuntu. I was considering getting new inside components and running Windows 7 (basically switching out everything) Any tips or suggestions? Trying to make it a gaming centered computer
Probably WON'T work. The original motherboard is a proprietary design, so a standard ATX or even micro-ATX will not simply mount to the motherboard tray.
Google your old PC (Dell Dimension 8250) and take a look at the pictures and you will see what I am talking about.
If you are doing a complete rebuild, save yourself a lot of headaches and frustration and just buy a new case: it will have better airflow then the old Dell and be easier to work with and within.