Problem with LiteOn DVD SHD-16P1S

Hi, I have recently uninstalled nero 8.0.2 to install a newer version and my two DVD players dissapeared (LiteOn DVD SHD-16P1S & TSSTcorp CD/DVDw SH-S182D).:a

I’m running with windows XP sp2 media center and when i look at the system it says that the drivers are properly(?) installed but it doesn’t recognize the hardware (my players seems to have dissapeared).:confused:

Thanks by advance for your help and excuse my poor english (i’m belgian).

Bye. Dr Gonzo.