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Here is a place to start for price comparisons. Amazon.co.uk: external dvd player
a disk drive is a fundamental part of windows, simply adding an SSD or upgrading to 7 will not stop one working. Do they show up in task manager and or has your son unplugged the SATA power connectors to them to power the new SSD??
I think badger meant to say Device Manager, not Task Manager. In Device Manager you should see them listed as DVD/CD-ROM Drives. If your son unplugged the power connectors because power was needed for the ssd, then there are splitters and adapters available that can be used to provide power for the drives using other available leads from the PSU.