Tarun PC, were not trying to be insulting were trying to help, if you do not want our help then go away.
Here is my final answer on the subject, your Dell 460w power supply in theory can power a 1060, BUT DOES the Dell PSU have the 6pin cables the 1060 Needs to use power from your power supply toi run at all in your computer?
if you look at this picture the arrow point to the power connector NEEDED from the Power supply, if it had this your good, if not you need a new power supply.