I bought Windows Server 2008 R2 Foundation of HP.
Then, whilst the installation, it says, it has not found any HP platform and it may not be installed. That's correct. I don't own a server of HP but a virtual machine running under VirtualBox.
So I gotta help my bought software along. I emphasize the word "bought". I own it and I want to use it. Why the "bios hardlock" to HP hardware? Sure, the intension of HP is clear. But that's probably not legal in Germany.
Luckily I want "Windows Server 2008 R2 Foundation of Hewlett Packard" (in german) to be installed in a VirtualBox VM.
How do I solve that problem?
After a little search I do find out, that the software searches for a HP-BIOS, before it allows Windows being installed.
VBoxManage setextradata "VM Name" "VBoxInternal/Devices/pcbios/0/Config/DmiBIOSVendor" "HP" VBoxManage setextradata "VM Name" "VBoxInternal/Devices/pcbios/0/Config/DmiSystemVendor" "HP"
And now it's possible to install Windows Server 2008 R2 Foundation under VirtualBox. Yay!
Here's a list of possible BIOS settings for VirtualBox: