RECOVERY WINDOW will not restore after DEEP SCAN

have just deep scanned a 750GB 2.5" HDD which has a lot of data to recover am using Recuva Pro

have done a recovery check but the window that was minimised to task bar will NOT restore to full window this has happened 4 times in the last 4 days

HELP

have tried all the usual options of alt tab etc and tried to right click restore but nothing works.

Dont want to keep scanning and not get anywhere