Hi Richard,
There is information available on Windows 8 compatibility centerfor FOSCAM IP Camera model "FI8910W” and "FI8918W" but not for "FI9821W".
Program compatibility is a mode in Windows that lets you run programs written for earlier versions of Windows. Most programs written for Windows 7 also work in Windows 8, but some older programs might run poorly or not run at all.
If FOSCAM IP Camera model FI9821W is not compatible with Windows 8 you may try installing the same in compatibility modeand check if it works.
If still the issue persists you may contact the device manufacturerfor help.