Norton antivirus 2005 or System suite 5 HELP

[S.P.G]

what one would you use?

System suite 5.

or

Norton antivirus 2005.

I have both but my system slows down when i run the at the same time..

Any one no what one to go for.....

[Flexor]

I have Norton 2004, some people don't like it and say it lets viruses in, but I'ts done me alright. 2005 is probably a lot better again, but I am no expert. I don't like the slow computer startup with these types of firewall/virus programs but I guess they are essential.