As others have said there should be a way of dragging and dropping the emails from the trash folder into your inbox. Is there a square next to each email? If so click the square to put a tick in it and repeat for all those that you want to keep. There should be an option then to move those...
Please tell me where you are getting 1 terra byte solid state hard drives from for £60. Bearing in mind that you are still looking at paying £200 for a circa 240gb drive on most sites it seems like you've stumbled across the sale of the century.
As for the BGs problem forget about the USB key...