Sound suddenly goes off

> I have a Windows XP system with over 700 mb ddr memory,
> 1.5 gighz processor and 10 gigs of harddrive space. No
> brand name, it's a clone.
> Problem ONE:
> After using the computer for about two hours the sound
> quits. After using it after a day the keyboard goes
> dead. Rebooting it helps, they are both restored. What
> can I do to make it quit loosing my sound and my keyboard?
> Problem TWO:
> I bought a burner Memorex 52x24x52 a year ago. I have
> used it maybe 5 times, and not it won't burn anymore. It
> says: Could not perform EndTrack, Write Error, Invalid
> write state, Session fixation error, Could not perform
> Fixation. These messages display on my Nero6 burner
> software. What's the deal?
> Help please!
> I will greatly appreciate your response...
> Eri
> .
>
>