NT troubleshooting?

NTLDR file is composed from two parts. The first is StartUp module and immediately following the OS loader (osloader.exe), both stored within that file. When NTLDR is loaded into memory and control is first passed to StartUp module, the CPU is operating in real mode. StartUp module's main task is to switch the processor into protected mode, which facilitates 32-bit memory access, thus allowing it to create the initial page tables and enable paging. This provides the basic operating environment on which the operating system will build. StartUp module then loads and launches OS loader.