found this on the internet:

Recently the following undocumented error-codes were found. MicroSoft forgot to explain them in the manuals

WinErr: 001 Windows loaded - System in danger

WinErr: 002 No Error - Yet

WinErr: 003 Dynamic linking error - Your mistake is now in every file

WinErr: 004 Erroneous error - Nothing is wrong

WinErr: 005 Multitasking attempted - System confused

WinErr: 006 Malicious error - Desqview found on drive

WinErr: 007 System price error - Inadequate money spent on hardware

WinErr: 008 Broken window - Watch out for glass fragments

WinErr: 009 Horrible bug encountered - God knows what has happened

WinErr: 00A Promotional literature overflow - Mailbox full

WinErr: 00B Inadequate disk space - Free at least 50MB

WinErr: 00C Memory hog error - More Rame needed. More! More! More!

WinErr: 00D Window closed - Do not look outside

WinErr: 00E Window open - Do not look inside

WinErr: 00F Unexplained error - Please tell us how this happened

WinErr: 010 Reserved for future mistakes by our developers

WinErr: 011 Window open - Do not look outside

WinErr: 012 Window closed - Do not look inside

WinErr: 013 Unexpected error - Huh ?

WinErr: 014 Keyboard locked - Try anything you can think of.

WinErr: 018 Unrecoverable error - System has been destroyed. Buy a
new one. Old windows license is not valid anymore.

WinErr: 019 User error - Not our fault. Is Not! Is Not!

WinErr: 01A Operating system overwritten - Please reinstall all your
software. We are terribly sorry.

WinErr: 01B Illegal error - You are not allowed to get this error. Next time you will get a penalty for that.

WinErr: 01C Uncertainty error - Uncertainty may be inadequate.

WinErr: 01D System crash - We are unable to figure out our own code.

WinErr: 01E Timing error - Please wait. And wait. And wait. And wait.

WinErr: 01F Reserved for future mistakes of our developers.

WinErr: 020 Error recording error codes - Remaining errors will be lost.

WinErr: 042 Virus error - A virus has been activated in a dos-box. The
virus, however, requires Windows. All tasks will automatically be closed and the virus will be activated again.

WinErr: 079 Mouse not found - A mouse driver has not been installed. Please click the left mouse button to continue.

WinErr: 103 Error buffer overflow - Too many errors encountered. Next errors will not be displayed or recorded.

WinErr: 678 This will end your Windows session. Do you want to play another game?

WinErr: 683 Time out error - Operator fell asleep while waiting for the system to complete boot procedure.

WinErr: 815 Insufficient Memory - Only 50.312.583 Bytes available.