Home button takes me to the Default Android Home on HTC Desire X

The home button on my HTC Desire X used to take me to the HTC sense home. But once I stopped HTC sense from settings-apps & from then on, it takes me to the default android Home (the one with the snow capped mountain etc). Even after I restarted HTC Sense, Re-started the phone & even Factory reset the phone, this behaviour still persists. How do I get back my original home button functionality.