Reply: It is possible that the operating system was damaged by a virus, and the osloader.exe file was also damaged. Recently, there is a virus called Trojan.Siggen9.12065, which will damage some core files of the system and cause window 10 to keep prompting the user to enter fast mode every time it starts up. This Trojan spreads quickly, and many computer operating systems are damaged. It is recommended that you use antivirus software to remove the Trojan, and then download normal files to overwrite the damaged files.

Reply: If your system has been damaged by a virus, you should first install a powerful anti-virus software. After removing the virus, download the normal file, and then overwrite the file damaged by the virus. In addition, it is best to enter safe mode and then start anti-virus software to check for viruses, which can remove most viruses.

Reply: Currently we have not found osloader.exe for Win8.1, but you can export this file from a machine with Win 8.0 or Win8.1. The steps are:

Open the ntldr file and search for 4D5A (the mz header of the PE). Starting from 4D5A to the end is the binary code of the osloader. Export, and modify into osloader.exe

Reply: So far I have not noticed that there is a 64-bit version of osloader.exe. The file started working before entering the operating system. It was responsible for loading some data and protecting some important files on the system.

In fact, I suspect that some of your system kernel files have been destroyed by the virus. When osloader.exe starts, certain data or function of these files will be called, as these files are destroyed, osloader.exe running errors occur. The common errors are:
the memory could not be read at "0x00000000"
the memory could not be written at "0x00000000"

I think you need to find an installation CD to re-repair your operating system.

Reply: In fact, your problem may not be cause by osloader.exe, and it is likely that the system was infected with the virus, resulting in the system's core file being modified.

osloader.exe is a very important system file which is responsible for loading the system kernel files and drivers.

In addition, osloader.exe file has an output function called BlLoadImage which can load the executable program into memory, and at the same time determine whether the original file was modified.

If your system kernel file has been modified, or the version is wrong, there will be some error messages.

The normal software is not to modify the system core files, so generally your system is likely destroyed by the virus. It is best to use anti-virus software to have a thorough detection.

Here good anti-virus software is recommended. Click here to download antivirus software.