Help with security I am running windows XP my computer came with madesafe already installed?

but virus protection was out of date and it recommended windows live one care which I installed and it now says virus protection upto date,however i'm a BT yahoo broadband customer and that has norton anti virus as part of the broadband package..Will it damage my PC or slow it down in any way running both of them

Help with security I am running windows XP my computer came with madesafe already installed?microsoft office

you should not run two anti-virus programs together it will cause problems, Norton is the best choice because there has been a lot of problems reported with Onecare such as missing viruses.

Help with security I am running windows XP my computer came with madesafe already installed?norton antivirus

Never use 2 anti-virus, as they will conflict with each other and cause problems. Uninstall one of them.