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Bad Fault in MS-DOS Extender
This error message occurs when the fault handler dispatcher in DOSX.EXE generates another cascaded fault while trying to handle a protected-mode exception. This error is usually caused by one of the following factors:
•HIMEM.SYS is unable to control the A20 line.
•DOS=HIGH is not functioning properly (related to HIMEM.SYS control).
•The RAM, static RAM (SRAM), single in-line memory module (SIMM), or dynamic RAM (DRAM) chips are not functioning properly.
•You are running DR DOS. •The third-party memory manager is not configured correctly.
•The EMM386.EXE NOEMS x=A000-EFFF line is missing from the Config.sys file.
•You have an old, out-of-date ROM BIOS. •Your CMOS settings are incorrect.
•Your Windows files are old or corrupted. To test this, create a new directory on the hard drive, and install Windows in that directory. •Your disks are corrupted.
•Your system is infected with the Form, Forms, Noint, or Yankee Doodle virus.