lost data from the folders

I have lot of data saved in skydrive folder which I sync everyday.. It also included pictures. However, i opened them after 2-3 months, I found while the picture folders are there but they are all empty... all the images saved in them are missing..while all other data is intact.  I checked on the web account too.. it also shows it as empty..  I hv checked in trash too.. data is not there either... They were like hundreds of pictures and work related.. Please help me recover back the images...