Help: can't get to registration screen

Satellite

Hi all,
I use navigon 4.2 on a Transonic. I changed one of the skin pictures and saved as menu background but, I didn't realise it was the wrong bit format.
The screen went blank and, try as I may it stayed blank. Had no choice to do a hard reset .
Installed the software as normal and when it asked me that previous settings had been found I opt to keep them. Same problem the screen stayed blank. Hard reset again and reinstall, this time I chose no to the previous setting. I don't get the registration screen but another screen comes up saying: WRITING INFORMATION FOR "REMOVING PROGRAM" after 10 minutes I can see the navigon Home screen, then I get messages that my memory is too low and to adjust it in windows. Thereafter, it basically get into a loop and everything comes to a halt for the luck of memory.
Does anyone has any idea how to delete the flie/s that olds the previous settings data so I could do a "as new" installation?
Any help greatly appreciated.
Thanks

PS emailed both UK and german support many times, no answer

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