I have PC Cillin on my XP. Should I disable XP's virus, firewall, etc.? Will they conflict with each other? Pc Cillin Seems to work fine on its own. Thanks.
If PC-Cillin has a firewall, then disable the XP-firewall. The XP one is no good anyway, it only stops incoming traffic.
If PC-C has NO firewall, then get a free one from e.g. www.sygate.com
XP has no built-in antivirus, so you can't disable that.