My computer has wiped my tom tom one i now have a red cross how do i fix this

your tom tom need a sim card what go on the side of it that y you got the red cross through it please go back to the shop where you got it and ask for you tom tom sim card then it will work 100%

If the unit is giving you yelow message like a warning can be the charging connector .Fix That problem first and after fix the software isue.
If you dont knoe how just send it to a repiar centre .
Try this one www.satnavservice.com

This problem is due to the memory card not containing the TomTom application or map. To update the application onto the memory card, Connect the device to your computer. Open the TomTom Home application. Click on 'Update My Device'. This should then install the application onto the SD card. Alternativly, you could perform all the steps above without the SD card in the device, this will install the application onto the internal memory. Note: you may also need to install your maps, voices, etc after you update.

http://www.tomtom.com/support/index.php?Language=1&query=red+cross&FID=1898

Red cross issue:
http://www.tomtom.com/support/index.php?Language=1&query=red+cross&FID=1898

Device not recognised by PC:
http://www.tomtom.com/support/index.php?Language=1&query=connect+to+home&FID=7375

Device not recognised by TomTom Home:
http://www.tomtom.com/support/index.php?Language=1&query=connect+to+home&FID=7375

Ah, another case of the Red X. No worries, it can be fixed. Most likely your connection was interrupted during an installation or removal of software features. Follow this guide to get your TomTom back up and running.

You have to make a manual back up of the device. Make a new folder on your desk top. Connect your device to your PC and turn it on. Go to my computer and look for tom tom storage device and open it. You will see all the folders that is in your tom tom. Copy and paste just the yellow ones into the new folder. When you have done this you can know reformat your device. Do this by right clicking on the tom tom logo (in my computer). Click fat 32 (full format). This will wipe everything off. Disconnect your device, you will see a red cross on the screen. reset the device with a paper clip (hold in for 30 sec) You will still see the red cross. connect back up to PC and install the latest application of to tom home on to the device. From here you can go to add maps ect, and put your maps back on the device. Tom tom home will give you all the updates your device will be missing. You will only need the maps so don't worry if you can not copy all folders (for whatever reason) you can get everything you need as well as free updates for free via tom tom home. Its only the maps you have to pay for.

The red cross means its been wiped usually. Connect it to your pc and go to my computer. Click on the tom tom logo and see what is on your device. The maps should be there in yellow folders. Copy and paste these in to a folder. Then reformat the device by right clicking on the logo and selecting fat 32. When done reset the device for 30 sec and connect back to your pc and install the latest version of tom tom home. You can then get all the fee updates, thhen go to add maps where you can put your maps back on from the folder you made

Go to:
http://www.tomtom.com/support/index.php?Language=1&query=file+access+arror&FID=8324

Follow instructions...

I had the same issue after installing updates, I contacted tomtom & they talked me through it.

I think i had to wipe the card & through my tomtom home software they reformated the card & go it sorted.

http://www.tomtom.com/support/index.php?Lid=1