Loss of Computer Data

U can Recover Your data by using  EASEUS DATA RECOVERY SOFTWARE 

What exactly you mean by data loss??

Does you system fails to start/ boot? or, you can boot but, don't find your data, i.e. you deleted by mistake or it got corrupt?

In case of former, you can try hooking up your hard disk to another working system and copy necessary data. If you deleted (permanantly) by mistake, you can try some data recovery software, make sure you don't create any new files on that partition or the hard disk, as the files aren't actually deleted from the hard disk when you delete, but they are actually deleted when another file require space.

Thank You Sidd

Actualy  My Fellow delet some important data and I tried on System restores but it there are systems are off.