There are quite a few of those.
https://en.wikipedia.org/wiki/List_of_AMD_Athlon_XP_microprocessors
They all support SSE. It does look as if there are only a few that support SSE2. Do you see a brand and model number written on the motherboard. There should be a label around the CPU or card/memory slots. There should also be a board revision number, that may be of importance. Bare with me, I'm not familiar with AMD and need to look everything up as we go. But if you don't want to bother, just say the word.