Key-Problems at a German Windows-7 Notebook

Are there any additional keyboard settings to do? Typing into a Xojo editior Window is working, but no cursor key or backspace key is doing its job here. So what can I do to start serious work on my German Windows-7 notebook?

I have tested it in a virtual Windows-7 OS at my iMac. Here editing it is working. But not when I am using my german notebook …

Executing Xojo (here at Windows 7 64-Bit) in Windows XP compatibility mode seems to cover this problem.