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DOS ERROR MESSAGES
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128K NOT OK, PARITY DISABLED
The first 128K of your RAM has failed the POST. First, reboot. If the error is still there, you likely have a problem with your RAM. Try switching banks of memory. Move your second bank to your first bank, and vice versa. If you really want to fix the problem, replace the SIMM that is located in SIMM slot 1. 
8042 GATE-A20 ERROR
Usually caused by a bad keyboard. Try a different one. 

8087 NMI AT XXXX.XXXX. TYPE (S)HUT OFF NMI, (R)EBOOT, OTHER KEYS TO CONTINUE
Your math coprocessor has generated a Non-maskable interrupt. Have your math coprocessor tested. If it has failed, replace it. 

ACCESS DENIED
Your have tried to perform a write function to a read-only file. If using a floppy, make sure the disk is not write-protected. If you really want to delete the file, you can change it be a regular file, then delete it. In Windows 95, right click the file, choose Properties, then un-check the "Read-Only" box. In DOS, use the ATTRIB command. 

ALLOCATION ERROR, SIZE ADJUSTED
CHKDSK is telling you that the physical size and the allocated size of a file do not match. It is not a big deal, but if this error is gotten often, backup your hard drive, because this is sign of a coming failure. 

ATTEMPTED WRITE-PROTECT VIOLATION
You tried to format a write-protected floppy diskette. 

BAD DMA PORT = XX
Your DMA controller chip on the motherboard has failed the POST. You will likely have to replace your motherboard. 

BAD OR MISSING COMMAND INTERPRETER
More than likely, you are trying to boot from a disk that is missing COMMAND.COM. If this is a hard disk, replace this file into the root directory. 

BAD PARTITION TABLE
Try reperforming FDISK on this drive. After this, if you still get this error, try low-level formatting the drive. Another possibility is that you have picked up a computer virus which has damaged the partition table. Try running anti-virus software.