If you absolutely refuse to go offline, use for file scanning and Malwarebytes 3.5.1 for emergency cleaning. But understand this: You are a ghost in a machine. The viruses of 2026 are designed for Windows 10 and 11. They won't even try to infect you—but the automated bots scanning for ancient XP machines will own your system in under 10 minutes.
The best "antivirus" for SP2 is a pair of wire cutters to snip the network cable. antivirus free windows xp sp2
Have a retro XP war story? Let me know in the comments. If you absolutely refuse to go offline, use