Dell Inspirion 17R 5737 with i7 Intel

win 8.1 64 bit

Looking at Task manager , there is only 4 cores. I want to enable hyper threading to have 4x2 cores when I look into task manager.

I have also Inspirion 15r with 2 cores (i5) and can see 4 of them in task manager.

Try to find solutions on net but without success.

Please help...

thanks