VirtualAlloc fails on specific memory address

@MarkusO:
Quote from MSDN:

The function fails if you attempt to commit a page that has not been reserved. The resulting error code is ERROR_INVALID_ADDRESS.

@Snatch:
I could allocate any memory region I tried. The mistake here was that MarkusO tried to commit a page which was not reserved. I never heard about that "process address space" rule, like you call it, before.