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Any thoughts would be appreciated, Harry Here is a list of several free A/V programs, many of which work on Windows XP: https:// Microsoft Security Essentials is no longer supported on Windows XP, as noted in the link posted above by Bruce.
If upgrading your operating system is not an option, you can still expect continued Firefox security updates until September 2017.
In March 2017, if you are using Firefox with Windows XP or Windows Vista, you will automatically be updated to the Extended Support Release version of Firefox.
Microsoft itself ended support for Windows XP in 2014 and will end support for Windows Vista in 2017.
Unsupported operating systems receive no security updates, have known exploits, and can be dangerous to use, which makes it difficult to maintain Firefox on those versions.