Follow the steps
here to directly install app 9.061, and you should be fine.
reggavegga - Have you done what MVL suggested??
The XXL540 does not have a hard drive. It has a 2gb solid state flash card. Since you are copying over and deleting various files - probably nothing wrong with the storage.
A complete FORMAT of the card - using Windows - (and not quick format) followed by MVL instructions - might help.
Then you have to purchase a map; and if you want lifetime maps and lifetime traffic - have to purchase those as well...
Not at all sure how you would advertise to sell a device which you consider toast - and which you have been working on for almost a week... That doesn't seem quite fair.
The XXL540TM sells for $125.49 (including shipping) new - and with warranty - when shopping diligently. They are being phased out.
TT support is frankly - a major joke. You have to call a dozen times, and really fight - to possibly get someone who doesn't just tell you WHATEVER - to get you off the phone... because that is mostly what they do...
If it is possible to get this 540 working - you should first backup all the junk which is currently on it - using Windows Explorer. Set to "show all files, and show known extensions.) Then you should FORMAT the device in Windows (have to login as Administrator /or have admin authority); and then you should follow MVL's instructions.
If you are not able to get it working by following helpful instructions from this forum - you should throw the device away; and go on with life.
D.