According to the motherboard specs, there are no PCI Express or AGP slots, which limits you from upgrading to a decent graphics card. Windows 7 isn't very demanding. If you are running Vista on that computer now, more than likely you can run Windows 7.
Actually I am running XP Pro. I ran the MS application to see if I could run W7 and it told me the graphics card would not run W&. It sounds like I need to open it up and see if there are any slots that I can put a graphics card in.
I assumed that because I had open slots, I could put a new graphics card in. Maybe not. Comments?
The specs list zero PCI-Express and AGP expansion slots. There are a few PCI graphics cards out there but I think the larger hardware issue is your entire computer. It's pretty outdated and I would consider an upgrade. You can always stick with XP Pro, which is still largely more stable than Windows 7.