Q: any problems with Norton on iMac?

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As all antiviruses in Mac OS X, they are useless (we only recommend ClamXav and Sophos, and only to search Windows viruses) because you don't need any antivirus. OS X has got its own security systems. If you want more information about OS X and malware, read > http://www.thesafemac.com/mmg

In General 3rd Party AV Software is Not Required as Mac OS X tends to look after itself.

Read Here  >  Antivirus Discussion

To keep your Mac Happy... See Here...

http://support.apple.com/kb/HT1147

http://www.thexlab.com/faqs/maintainingmacosx.html

Mac OS X: About background maintenance tasks

nytunde wrote:

 

any problems with using Norton on iMac?

Many problems with using Norton on iMac:

Slowing Down

Can't connect to the internet

nytunde wrote:

 

any problems with using Norton on iMac?

There used to be a ton of problems, but not so much these days. I don't know whether to attribute that to improvements in the software or simply that they have a fightening reputation from the past and don't enjoy the market share that they used to.

Since you have the most effective OS X A-V system already installed with Mountain Lion, I must ask why you are asking?  If you are having issues, it would be better if you started a new topic and described the issues.