I am losing files in itunes and my e mail won't work anymore

I cannot access my video files in itunes.  I moved the download location to an external but don't see the files.  It worked last night but stopped working this morning and Itunes is saying it cannot locate the file so it can't play.

You don't need a mouse to transfer the music over.  Just a keyboard that is an Apple USB keyboard.
Boot with the keyboard holding the T key on the eMac.  Wait for the Firewire logo to come on.
Connect a Firewire cable between your eMac and your other machine. 
Note the differences between Firewire availability on this image:
The top two Firewire ports are what the eMac uses.  Some MacBook Pros have it, others only have Firewire 800 or Thunderbolt.  For those that only have Firewire 800, you'll need this cable:
http://eshop.macsales.com/item/NewerTech/1394B96036/
For those with 400, you'll need this cable:
http://eshop.macsales.com/item/NewerTech/1394A66036/
Some MacBook Pro Retina models only come with a Thunderbolt port, that has the same Thunderbolt logo shown on the cable that adapts it to Firewire 800:
http://store.apple.com/us/product/MD464ZM/A/apple-thunderbolt-to-firewire-adapte r?fnode=51
which you'd come with the first cable from macsales shown above.
This is far faster than any connecting you'd establish via ethernet.

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