Windows 95 Error Codes
Recently the following undocumented Windows 95 error-codes were found. Microsoft forgot to explain them in the manuals, so they will be spread via the Internet:

WinErr: 001Windows loaded - System in danger
WinErr: 002No Error - Yet
WinErr: 003Dynamic linking error - Your mistake is now in every file
WinErr: 004Erroneous error - Nothing is wrong
WinErr: 005Multitasking attempted - System confused
WinErr: 006Malicious error - Desqview found on drive
WinErr: 007System price error - Inadequate money spent on hardware
WinErr: 008Broken window - Watch out for glass fragments
WinErr: 009Horrible bug encountered - God knows what has happened
WinErr: 00APromotional literature overflow - Mailbox full
WinErr: 00BInadequate disk space - Free at least 50Mb
WinErr: 00CMemory hog error - More Ram needed. More! More! More!
WinErr: 00DWindow closed - Do not look outside
WinErr: 00EWindow open - Do not look inside
WinErr: 00FUnexplained error - Please tell us how this happened
WinErr: 010Reserved for future mistakes by our developers
WinErr: 011Window open - Do not look outside
WinErr: 012Window closed - Do not look inside
WinErr: 013Unexpected error - Huh ?
WinErr: 014Keyboard locked - Try anything you can think of.
WinErr: 018Unrecoverable error - System has been destroyed. Buy a new one. Old Windows licence is not valid anymore.
WinErr: 019User error - Not our fault. Is Not! Is Not!
WinErr: 01AOperating system overwritten - Please reinstall all your software. We are terribly sorry.
WinErr: 01BIllegal error - You are not allowed to get this error. Next time you will get a penalty for that.
WinErr: 01CUncertainty error - Uncertainty may be inadequate.
WinErr: 01DSystem crash - We are unable to figure out our own code.
WinErr: 01ETiming error - Please wait. And wait. And wait. And wait.
WinErr: 01FReserved for future mistakes of our developers.
WinErr: 020Error recording error codes - Additional errors will be lost.
WinErr: 042Virus 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: 079Mouse not found - A mouse driver has not been installed. Please click the left mouse button to continue.
WinErr: 103Error buffer overflow - Too many errors encountered. Additional errors may not be displayed or recorded.
WinErr: 678This will end your Windows session. Do you want to play another game?
WinErr: 683Time out error - Operator fell asleep while waiting for the system to complete boot procedure.
WinErr: 815Insufficient Memory - Only 50.312.583 bytes available