Security / Firewalls :: Truecrypt Not Showing Data And Folders

TRUECRYPT not showing the data and folders I have windows 7 64 bit, I installed truecrypt, and the after that I create a folder put some data and encrypt it with truecrypt.But after few days stranger things happend,When ever I tried to decrypt the folder it don,t show that data.Also I cann't the file which I have to decrypt.Also another partation name L which have other folders can be seen but there is no data inside my folders.I haven,t encrypt the L partation.I left the partation for a month to fine a solution after a month one day the data appears itself and also the hiden folder to decrypt also appear and finally decrypt with the password.I copy few data and closed the pc.When restart the pc again same old problem occur.I cann,t see the folder to crypt it. How to recover my important data back .the partations are all NTFS , but not the and only folders were encrypted.