Can anyone answer a few computer questions?

here's the things you want:

3 or 4 core AMD processor. this way you could be doing homework, downloading a video tutorial, listening to music and your antivirus can do it's thing and everything will be running smoothly.

8 GB ram (ram is cheap).

at least a nVidia GTS 520 graphics card, its only 35 bucks. you'll thank me in 2018.

a 2Tb hard drive, should be large enough for anything you might need,

windows 7 pro 64 bit.

you want a simple tower case, everything should run cool & quiet. that means a light, airy case with lots of ventilation. since the computer has nothing of high performance you'd only need 2 fans: a case fan, a cpu fan. have your tech guy use the quietest performance fans possible.

a mid tower case is sufficient, something smaller will not have enough airflow and something larger is unnecessary. you don't need a window on the case or any lighted fans either.

With what you are using it for, any entry-level desktop computer's built-in graphcis card will be sufficient. For games, however, you will get better performance with an add-on video card. Go to tigerdirect.com and click on the video cards link under "Computer Parts." Your new PC should have a PCI-E slot. So get a card that matches what slot your computer has. They have some 1GB cards for around $30. Lean toward the NVIDIA cards. Get as much RAM as you can for what extra it costs.

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If we knew your operating system it would hep. Most any desktop with 4 GB of ram will work for you.