Thanks for this shabbir (and sorry for the delay in replying). I'm not sure that its pNp thats up because the device does get recognised (it the computer makes a noise to say it recognises the drive) it's just that I seem unable to open the device.

The drive is there because I use Microsofts SyncTool and syncronisation is fine but 'manually' trying to open it doesn't work (I've tried creating a shortcut to where I know the drive is for example, it allows the shortcut to be created but there is no response to a double click of the shortcut)