The little known Microsoft Enhanced Mitigation Experience
Toolkit (EMET) [now at a much easier to configure V4.0] is arguably the best security software for the Windows operating system.
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PS: Couple it with sudowin -
Sudo for Windows | Free System Administration software downloads at SourceForge.net - and you can be tighter than a mouse's ear'ole.
(Advised reading is
This is SMHAM2.ORG! and for more detail
https://www.sans.org/reading-room/wh...s-sudowin-1726 - you may well need to modify sudoers.xml to update checksums and get more granular control but it is really quite simple.)
AND (drumroll) they both work with the dreaded XP...
Mac