Troubleshooting and solution:
Shutdown and then turn on the system.
Tap the F8 key after POST to display Windows advanced startup options screen.
Boot the system using Safe mode with command prompt option.
Be at the prompt and type EDIT AUTOEXEC.BAT and press Enter.
On the text editor type SET DOS16M=2 & save and close the Autoexec.bat file.
Edit the Config.sys file using the command EDIT Config.sys.
Remove the NOAUTO parameter from the line DOS=HIGH, UMB, NOAUTO. (If NOAUTO is found).
Make sure that the line
Device=C:\Windows\Himem.sys
is right after the line DOS=HIGH,UMB
Save and close the Config.sys file and restart the system.












