|No promise that firefox hasn't done the same with those plugins, but I'm running XP SP3 and firefox 43.0.1. I've assumed the reason you can't install firefox is because of your Service Pack 2 level. SP3 is so old that MS does not have a download link for it that works anymore so if you want it and you do, you'll have to get it from majorgeeks or some other site.|
Press Windows key and Pause/Break key at the same time to see your Service Pack level, you should install SP3 if you don't have it, for example I can do 48 without upgrading with SP3 installed.
Get your firefox here
PS-- I do however also have a Pentium 4 or newer processor that supports SSE2. If you don't then that might be the problem.
message edited by melee5