Could be Windows network related - suggestions are network device not attached correctly or powered, or disk problems (floppy not inserted/not formatted/hard disk fault). Could it be on startup of your application it is looking for a network device or disk drive that is not turned on or faulty ?

HTH
Paul

>Which operating system are you using ?
>
>>An application written in FoxPro v2.6 which has been running happily for a long time - SUDDENLY gives an error message when launching,
>>
>>"A device attached to the system is not functioning"
>>
>>I don't know if this is a FoxPro Error or a system error.
>>
>>Can anybody help or advise?
>>
>>Regards