I need some help so I can avoid paying money to symantec for tech support for a product and subscription i purchased!!

was having problems with computer and did a full system restore. when restored the version of norton antivirus that came with the computer did not install correctly because, as i understand it now, of spyware. i did a spyware sweep and got rid of spyware but cannot find the infected and wrongly installed version of norton antivirus. i have a sunscription to norton antivirus and a firewall. i have the cdrom for the firewall as i bought it at a store but that will not install correctly. the syamtec/norton website is uselss unless you purchased the product online. now they want $30 to give me live tech support. i tried the online automated but cannot seem to find a fix. so here is what i need:

1. how to find and uninstall the bad version of norton antivirus (does not show in control panel/add/delete/programs)
2. how to have norton antivirus installed without a cdrom

THANKS!