Within the past couple months, something had happened to this computer, which had resulted in us having to....reinstall a fresh copy of XP, or something to that effect, because files had gotten messed up or something. Ever since then, the sound card hasn't worked, resulting in a really annoying beep for things such as when trying to exit from paint or notepad, and it asks if you wish to save anything that was changed, or when a task gets done, such as zipping or unzipping files. Also, Firefox randomly crashes depending on certain sites, especially ones with animated ads and such. In addition to that, when playing games (mainly), they will frequently close without error messages, and sometimes even BSOD. The only option my stepfather is thinking of is re-doing everything all over again, and I'm hoping to try to find someway to fix it without resorting to that, as it would take a lot of time. Any help would be appreciated.
On a side note, we use Catalyst Control Center and, ever since all this started, we had been getting an error message saying something around the lines of "The driver is not supported". I can give more information if needed, as I'm sure that isn't enough anyway.
Thank you in advance.