Airclues,
It is hard to guess without any details about the computer. Depending on the company that built the computer, they may or may not have loaded the drivers you need to play the game properly.
If you could provide us with either the specs on the hardware inside the computer or the make and model so we can look up the specs would really help.
I would start by getting you the latest drivers for your motherboard, video card and sound card. That should solve your issues.
Please include the operating system you are running when you reply.
Take Care,
Richard