Tomtom Nav 5 Can Anyone Help

Please Help
I Have Been Stupid Enough To Purchase Nav 5 For My Hp 1710 I Brought A New 512mb Sd Card Plenty Of Storage Space. The Tomtom Program Downloaded And Was Activated Perfect With No Problems. I Downloaded The British Maps And Post Codes From The Discs They Are All Showing On The Sd Card.when I Click On The Tomtom Icon The Pda Locks Up And Has To Be Reset With The Reset Button. I Have Tried Putting The Programs Onto The Sd Card Twice Now Without Any Joy.

Any Ideas?

I Have Sent Tomtom Three Emails Over The Last 2 Weeks Without Any Responce I Live In Hope

I have an Ipaq 2210 and have had a similar problem with lockups when accessing certain areas of the SD card. This was to do with mp3 files rather than Tom Tom maps but the result seems the same. I'm not sure whether your PDA has a CF slot too, but I now use the CF card instead and don't get the lockups.