I knew that was coming!
You have not said what version your maps are, 7 or 8.
Anway, you may have the files on your hard drive.
Look in the download directory that TomTom uses (set in TomTom Home). It probably looks like this: C:\Documents and Settings\(username)\My Documents\TomTom\HOME\Downloads\map\WesternEurope
You should see a zipped file called WesternEurope. zip (or close to that). If you use an unzip utility you should see a bunch of cspeechxx.dat files in there. Extract them to some location (temp folder, maybe?) on your hard drive and then move them (using Explorer) into your Western Europe folder on your unit).
But, and a big but...............
You MUST have the space on your unit to handle all you have there plus these speech files. You may not. If not, 2 choices: get a 4 gig sdhc card and move 1 map (and speech files) onto it and keep all your other stuff on internal memory or don't copy the speech files for countries you don't think you'll visit (for a while anyway)