Bluestacks keeps the data (if saved when uninstalling) in the following location: C:\ProgramData\BlueStacks\Android. The location contains FS files (Root, SDcard, etc). Inside those files there is stored the operating system, settings, and everything you've added to Bluestacks. If you plan to re-install Bluestacks, then the data will be accessed and profiles for WhatsApp and Hike will be available.
![enter image description here](http://i.imgur.com/rILRUxK.png)