Is it ok to install Webroot Spysweeper with anti-virus, with my Norton Internet Security with anti-v

I usually just use Spysweeper's spyware protection with Norton Internet Security, but I accidentally picked up their spyware and antivirus protection version. My Norton Internet Security has firewall, anti-virus, and spyware protection. So will this cause problems or just give me double protection?

http://www.webroot.com/consumer/products...

http://www.symantec.com/home_homeoffice/...

Is it ok to install Webroot Spysweeper with anti-virus, with my Norton Internet Security with anti-virus?cafe racer

it will cause problems, the norton will do the job. it wont play nice with others though.