Norton AntiVirus 10.0 Mac scan taking a long time

Hello all,

I purchased nav 10 awhile ago but unistalled it after it never found a virus. Today i read an article that said apple finally recomends using an av program so i reinstalled Norton. I'm running a mac pro v1 2.66 ghz 4cpu 4 gb ram. i installed norton succesfully and downloaded the liveupdate update to v4 so everything is up to spec. i started a scan on my main hd aprox 5 hours ago and it is not even half way done. the scan info indicates that it is scanning (austin powers voice) 1 million files. now before everyone gets excited i regulary clear my firefox cache and i'm running on a leopard install that is only 3 weeks old. when i watch the scan progression it says it is decompressing some files to scan them. i don't mind scanning all my files this time since this is the first scan. How can i make future scans faster without comprimising my securtiy ? how can i possibly have (wait for it1 million files ? the hard drive is 300 gb total with 205 gb used. i have movies and music but not that much stuff. i do have my old os x tiger system on the drive as i selected the archive and install option when i installed leopard. in addition to my main hd there is also a 700 gb raid array that has 400 gb of mostly video. i don't really want to scan it if it's going to take foreverrrrr. any and all help would be appreciated.