These problems are serious, but no one will be able to help you if you don't give specific detail.

Did all these problems occured at the same time, or at different times? Did you do something that caused all this to occur?

If you have no internet, how are you posting this? Does it only work in some programs? Do you get an error message when trying to access the internet? Do you have a router? A software firewall? Did your parents install an internet security program or something?

How can JJ2 and JJ2: TSF not run? Is there an error message? Illegal operation? Blue screen of death? Or does it just do nothing when you try to open it? Do you see the splash screen? Can you get into single player games? Can you join servers?

Is your sound card broken? Or is it your drivers? What was the last thing you did before the sound stopped working? Does it still work in some programs? Have you checked the physical connections, like making sure your speakers are plugged in, and they are getting power? Is the "on" light lit up on the speakers? Is the volume high up? If you turn the volume all the way up, then turn on the computer, do you hear a "gunshot" sound or a "click" sound come from the speakers? What type of sound card do you have? ISA? PCI? Is it plug 'n play? Sound Blaster? USB?

By memory do you mean the physical memory chips inside your computer? Or do you mean free memory? Are you sure you are not mixing up memory and disk space? Do you mean that you can't save any more big files onto the C drive? Or does your computer run slow and you can't multitask?

Please try and give specific details on each of your problems. I would especially like to know when these problems occured and if they all started at the same time when you did something. That is very important for me people to help you.