I too was sick of new pc's with Norton bloatware, but a good friend told me that gone are the days of Norton taking over your resources. on his advice i gave it a go, and havent looked back. i installed NIS 2009 back in November 08, and i am still using it now. it is the least intrusive Intrernet security i have ever used, it takes seconds to configure, and is not intrusive in anyway, in fact i dont even need to schedule a scan as it does it itself when the PC is idle.
It has been inconsistent in working with win 7 x86 dependant on which build it was, but i am using NIS 2009 on build 7100 x64, and it works perfectly. At the moment it is fluctuating between 0% & 1% cpu usage, and whilst scanning, it is between 7% & 35%, but as i said it scans automatically during idle time, so i never notice any usage. It installs in under 2 minutes, and a full scan with over 500,000 items scanned takes around 10 minutes, if you choose to scan yourself that is.
seriously, things have changed dramatically with Norton, and i cant speak highly enough of it. i never thought i would ever be saying that that a few years ago. If you are basing your opinion on Norton of the past, then i thoroughly recommend trying out the new versions, you will be surprised IMO.