You could right click on the "Free space" partition, and click on the New Simple Volume option to restore the partition. Afterwards, you could use your Active Recovery Partition program or a program like Recuva to try and recover any data from it.
I'm sorry for too late reply. I already assign a letter for the volume, but it appear as a unformatted partion so I cannot recovery any thing. Some one said that I should edit some sector (or merge with another partion) on it but I dont know how to do. Please help me