Hello everyone. Well, a couple of days ago I've been trying to fix apparently a "missing sound problem" on my computer. I did many things before contacting experts on the Audio & Video forum, they told me some other things to do to try to solve the problem, in those things were getting a malware program to scan my computer. I tried downloading many different programs, such as antivirus and malware programs but my computer won't let me install any of those. I hope anybody can help me out on this problem because as of right now I can't afford it to take it to "Geek" experts and I wouldn't like to format computer because I have some important information, but I'll leave this last option as an extreme emergency. Thanks.

Regards.

You could just backup your data and then install clean
If you cannot get into Windows, please see this Topic: How to recover your folders/files when Windows won’t boot

Otherwise, if you want to continue, please follow this guide and post the logs:
UPDATED 8-step Viruses/Spyware/Malware Preliminary Removal Instructions
Note: for steps you cannot do, (like Antivirus) just ignore

If I backup data from my computer, that means I will have to format my computer, correct?

No.
I recommend "backup" whilst you can (if you can)
Only because during any malware removal Windows may end up requiring a repair
And then you may even say, well if you are repairing may as well go clean install
So to jump ahead, I mentioned both backup and clean install of which is sometimes quicker

I tried backing up my data but I couldn't, don't know why. So what I'm planning on doing is put all kind of information I want to save on CD's/DVD's and then I'll just make a system recovery, which my computer would let me do. If I do a system recovery, do I require Windows XP CD? If not, is there anything in particular I do require? Thanks.

Regards.

This sticky will help backup any data that you cannot do normally in Windows: How to recover your folders/files when Windows won’t boot

I think "System Recovery" relates to an image of Windows Setup files already on your computer, this "image" is provided by your OEM Manufacturer as a full restore of Windows; Drives and Applications
Therefore you will not need your Windows Setup CD

I give up. I tried the "How to recover your folders/files when Windows won’t boot", but no solution. As mentioned before, I'm going to make some data CD's/DVD's and save all the things I need and once I'm done with that I will be doing the System Recovery once and for all. Thank you very much for your help.

Regards.