Hi, let me know the possibility of retrieving files which were accidentally deleted,

You don't say what your operating system is, but we'll assume Windows XP or Vista.
Look for a "Recycle Bin" icon on your desktop. Double-click that and you should see a list of deleted files. Highlight the ones you want and click "Restore the Selected Items". They will be put back into the original folders that they were deleted from.

I hope this is what you were looking for.
WallyH