To run Panda Antivirus on your XP machine, you must meet these minimum specifications:

Because Windows XP machines often have limited RAM (often 512MB to 2GB), heavy antivirus software can make them unusable. Panda uses a "cloud" engine, meaning most of the heavy processing happens on Panda's servers, keeping the local impact on your PC minimal.

Unlike "frozen" legacy versions of other software, Panda Dome (the current name for their antivirus suite) still receives signature updates on XP to combat modern malware.

Panda Antivirus for Windows XP: Still Your Best Bet for Legacy Security