Black Viper tells which services to disable, set manual, or set automatic
Gizmo's Tech Support Alert for freeware
Below the best paidware antivirus and firewall:
Online Armor (three versions: freeware and paidware)
Sandboxie has paidware and freeware versions.
Follow the advice and use the programs recommend by the sites or the four last listed, plus safe hex, and keep XP and all other programs updated. Use Mozilla Firefox browser (with NoScript, Refcontrol, and CSLite Addons) and Mozilla Thunderbird email client (with Allow HTML Temp and Addblock Plus Addons).