Common Windows error codes include "Stack Overflow" (error #6), "The system cannot find the specified device" (error #20), "An operation is pending" (error #600), and "The device does not exist" (error #608). Some Windows errors can be easily fixed, while others require professional expertise.
A stack overflow error can often be fixed by properly shutting down the computer and allowing it to cold boot. If the reboot does not solve the problem, the problem is likely from the RAM or Swap file and may be more difficult to fix. If a computer displays an error #600, it should be rebooted. After reboot, if the error continues and no other programs are using the modem, the computer should be checked for spyware.