IE-7 Browser Slowed Due to Norton 360, Please Help

Just joined your group, and first post w/a problem I'm hoping some knowledgeable member can help me resolve.

 

My computer is a Sony Vaio PCG-GRT360ZG w/Microsoft XP Home, Service Pack 3, IE-7 Browser. Last week, I had a problem downloading Norton 360 Online "Live Update". When I went to "Help", I was instructed to download the latest version of Norton 360. I did this, and after running 360 Diagnostic Report, my version is: 2.5.0.5.

 

After the updated 360 download I've quickly noticed that surfing around the internet has slowed, and full of stops and delays when downloading web pages. The new 360 version does have this "phishing bar" that seems to have replaced my older version's "Fraud Alert", but not sure if that is the root of my slowdown problem. Please help.

 

Another problem has to do again w/the "Live update". I'm getting a message that states an error and not all live updates were able to be completed. Trying to get more details, a Symantex error box appears "ERROR 405 Method Not Allowed". Don't know what to make of this. Pleae help. Thanks.