AC'97 sound card.
I just rebooted my computer because it wasn't working well.
Now I tried to download my sound card AC'97.
But when I installed it, it would say something like "your system might become instable if you continue installing". And there was an option continue or cancel and I selected continue.
Once I pressed continue it froze and my computer rebooted.
But on my computer before I rebooted it had worked when I pressed continue.
I tried every possible site to download my sound card and they didn't work.