I have a Toshiba U300-13U notebook.
It came with Windows Vista 32 bit but i installed Windows 7 32 bit after about 6 months.
Before i installed it my dvd drive would stop being recognised but this would fix if i restarted it.
After i installed it my dvd drive stop being recognised completely.
I have used the troubleshooter and the online troubleshooter. They both say it is not connected.
When i go into BIOS it shows the drive. At the device manager it has 2 devices with warnings which say "Base System Device". They don't have roll-back drivers or any driver options at all.
The Toshiba drivers from their site don't recognise it either.
I have run out of options.
If you uninstall the drive, it should search for the new hardware on restart, and reinstall itself. If it doesn't, you can right click the computer logo in the device manager, and force it to search for new hardware.