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(ended in 2014). Using it online is highly insecure. Only install XP in an offline environment (e.g., air-gapped PC or virtual machine for legacy software testing).

Windows XP Professional SP3 x86 : Microsoft - Internet Archive

For 99% of users, installing XP in a VirtualBox or VMware is smarter. Allocate 512MB - 1GB of RAM and a 20GB virtual hard drive. The SP3 ISO will boot instantly in a VM without driver issues.