I did a deep scan with Recuva for deleted video files on my computer over night and when I woke up the scan was finished with huge results.. but i had to reboot my computer cause of an issue, now the Recuva search results disappeared after reboot.. do I have to scan again? or is the previous scan is hidden somewhere?? HELP
Yes you have to scan again.
The reason is that things on the drive may have changed during the reboot and what may have been recoverable before may not be now as it may have been overwritten.
Anything that might change a drives contents means that Recuva needs to do a re-scan.