What version of Psoc Creator are you using? Have you updated Kitprog to the latest version? What Com port is the kit showing up in?
Thank you Bobgoar. I use pSoC creator 3.3. I found what was the issue. I found that KitProg can be used in mass storage mode too, and when in that mode it is not recognized as a COM port but as a memory device. Also, in mass storage mode pSoc creator can not be used. By pressing reset switch for 5 seconds, it comes out of memory mode. And now I am able to connect it to PSoc Creator and Psoc programmer.