Sounds reasonable to me but since I'm a mac person I've only seen 2 viruses & one I found on a CD the other on a zip disk. Norton seemed to do a good job reading the CD. A couple of other things you might consider; see xtra tools:

* ad-ware http://www.lavasoftusa.com/software/adaware/ (Free)

* Spybot - Search & Destroy http://www.safer-networking.org/en/mirrors/index.html (Free)

* Peerguardian: http://peerguardian.methlabs.org/pg2.html