Most new users might not know that you need more then one
antispyware remover just one isn't gonna detect all kinds
of spyware

What I recommend to download out of spyware removal programs is

1. Ad-Aware SE Personal Edition
2. Spybot Search & Destroy
3. Spyware Doctor
4. Webroot Spy Sweeper
5. Hijackthis

Just to make sure

Also Norton might not detect all kinds of viruses either try another antivirus like AVG or Avast Home Edition goodluck