...Are you using your usual media? They vary.
Possible driver corruptions:
Start - control panel - system. Look for the device drivers under CDROM. Open the category and delete the cdrom from there.
Re-boot! You may find that you have your services back now.
Possible loose data lead or mains plug.
This is where you have to take off the side panel and look inside. Find the drive and check that the data cable is secure [both ends of it]. The best way to do this is to disconnect and reconnect. Then check the mains lead from the power supply. Do the same to it. Then re-boot!
If these suggestions don't work, I'm sure the gang here will come up with others - let's get this thing working lads & lasses!!!