I did a bit of digging around and on looking at the Event Viewer I found the following message:
The device 'DVDRW 18X18X12X SCSI CdRom Device' (SCSI\CdRom&Ven_DVDRW&Prod_18X18X12X&Rev_ZA32\5&2cd13f55&0&010) disappeared from the system without first being prepared for removal.
For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
I went to the Help and Support Center and got the following information:
Details
Product: Windows Operating System
ID: 12
Source: PlugPlayManager
Version: 5.2
Symbolic Name: ERR_SURPRISE_REMOVAL_2
Message: The device '%1' (%2) disappeared from the system without first being prepared for removal.
Explanation
A device was removed from the system before the Safely Remove Hardware applet in the system tray was run.
User Action
To safely remove a device
Open the Safely Remove Hardware applet, select the device, and then click Stop.
A window prompts you to confirm the device or devices that you want to stop.
Now it is safe to remove the device.
So I think what I need to do is to reinstall the DVD and CD drives. Am I right in my assumption and if so what is the easiest way to add them? I cannot find the 'add hardware' section in Control Panel