Mega 2560 - Win 7 Home Premium

Hi

My board was working correct under WinXP - now I changed to Win 7 Home Premium connected the board and nothing happens despite the power LED lightning ...

No way to install drivers, the board dosnot show up in the DeviceManager.

I tried all USB ports on my computer and all different USB cables I have found

Any suggestions what else I could try?

Thanks in advance for your help

Miguel