[Pwnilicious]

Is it possible to write a driver that changes registry settings in HKLM? If so, is there a guide or something on how to do that?

Thanks in advance.

[cjbi]

Please, read MSDN.

Using the Registry in a Driver http://msdn.microsoft.com/en-us/library/windows/hardware/ff565537(v=vs.85).aspx
Using a Handle to a Registry-Key Object http://msdn.microsoft.com/en-us/library/windows/hardware/ff564929(v=vs.85).aspx