Windows phone 7.5 not support Norton mobile phone antispyware

hi, I have recently bought a Nokia Lumia 610 windows phone. I am going to use it for internet banking and share trading. However, I am unable to install a Norton  antispyware. It said windows phone did not support it. Do you have any advice regarding how I can install an antispyware or antiphishing in my smart phone?

hi, I have recently bought a Nokia Lumia 610 windows phone. I am going to use it for internet banking and share trading. However, I am unable to install a Norton  antispyware. It said windows phone did not support it. Do you have any advice regarding how I can install an antispyware or antiphishing in my smart phone?