Is there a way that I can prevent Norton from slowing down my computer?

I just installed Norton 360 last week and it has really slowed my computer down.

Is there any way to fix this, please? 

 

It is a brand new HP Pavillion 500-c60. 

1 TB 7200 rpm SATA hard drive.

AMD Quad-Core A6-5200 APU with Radeon HD 8400 Graphics (2 GHz, 2 MB cache)

8 GB 1600 MHz DDR3 (1 x 8 GB) RAM

 

Any help would be greatly appreciated! 

Many thanks,

Ann-Marie