Nothing Opens Please Help

Registration date
Sunday April 10, 2011
Last seen
September 4, 2015
I have installed Windows XP SP3. Yesterday I ran MSRT after that no file opens. There is a lot of data in my PC and it is all so much important... From family images to office files of high priority...

The images thumbnails are showing but when I open it, it says No preview available.
Office files are not opening saying it is corrupt and so on with all files...

Please help me out, please.

Thanks in advance...

Feroz Ahmad.