Try this solution:
STEP 1 Un-install Tom Tom Home from your PC
STEP 2 Click on the link below:
This will download a little removal program for the Tom Tom Home program.
A Black window will appear briefly then close.
• Make sure that you have got Administrator rights on the PC. Otherwise you may not be allowed to connect new hardware (especially the case when using office computers)
• Reboot your PC
STEP 3 Visit Tom Tom website and download the current new version of Tom Tom Home and install it to your PC
STEP 4 Connect the TomTom
• Make sure the device is fully charged before connecting it to the computer. Ideally a mininum of 4 hours charge.
• Reset the device using a paper clip (see http://www.tomtom.com/6965)
. When resetting, keep the reset button pushed in for at least 20 seconds, but DO NOT turn the device back on just yet.
• Ensure that your TomTom has power connected to it. There should be a green light on the TomTom unit. If your device came with a Home Charger, please make sure that is plugged in to the TomTom also.
Your Tom Tom should ask you to 'Connect to Computer' if it does tap YES.
Your unit should now be recognized by your PC.
IF IT DOESN'T then follow the instructions below:
1. Connect your unit to your PC;
2. Copy two folders to your PC (namely 'Raster' and the one which holds all your maps - probably called 'United Kingdom and Eire';
3. Using Windows Utility, right click on the Tom Tom drive unit and select Fomat;
4. Switch off the unit and soft-reset it with a paper clip (but hold it in for at least 20 mins) and then re-connect it and power it up;
5. Tom Tom Home should now detect the unit and your unit should ask you to 'Connect to Computer' so tap YES;
6. Tom Tom Home will now say your device needs updating - and if you apply all the changes it will restore it to Factory Finished!
7. Then all's needed is to replace the two folders you backed up and any other items like mp3's and sounds, pics, etc.