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Solution:
Back up the current MSDOS.SYS file by typing the following commands at the prompt:
c:\>cd\Windows\command
c:\msdos.sys -r -s -h
ren c:\msdos.sys msdos.xxx
Use the SYS command from the Startup Disk to transfer the system files to the hard disk.
A:\>
sys c:
Replace the new MSDOS.SYS file with the backup copy.
c:\>
cd\Windows\command
attrib c:\msdos.sys -r -s -h
del c:\msdos.sys
ren c:\msdos.xxx msdos.sys
attrib c:\msdos.sys +r +s +h
