intel i7 CPU running hotter after latest Windows 10 update

I bought a Dell 5558 i7 couple of months ago with windows 10 installed. 

The laptop was running fine, until the windows 10 update couple of weeks ago, post which the CPU is running hotter. I had download an program to check the temperatures, it is running at 68 - 78 Celcius. The fan is constantly ON even when I turned the laptop ON after a 8 hour shutdown. 

I did a system restore to before the install the temperature were then running at 45 - 59 celcuis. Anyone else having this issue ? 

Any solutions ?

Thanks in advance !!