Originally EMM386 was required to provide EMS memory, an alternate form of extended memory. Now with the sparse use of EMS, it's primary purpose is to provide support for loading real-mode device drivers in the upper memory area.

Open the CONFIG.SYS file found in the root directory of your C: drive using Notepad or another text editor (not Microsoft Word or any word processor).

At the top of the file, after the HIMEM device, add a line with the text "device=c:\windows\emm386.exe NOEMS" where 'c:\windows' is the path to the himem.sys file.

These changes will take place on the next reboot.

Disclaimer: Modifying the registry can cause serious problems that may require you to reinstall your operating system. We cannot guarantee that problems resulting from modifications to the registry can be solved. Use the information provided at your own risk.