No, you need to explicit create a OGL 3 context to use it.
Im actually quite confused about GL versions. I guess the 3.3 is what my GPU supports but that cant be the one that the compiler uses cause Im using fixed pipeline functions.(Which were removed in 3.2)
Update the drivers on the XP machine. Are you using shaders ? Are you using ARB extensions ? Which one ?
Get very sleepy, a very easy to use profiler which should pin down the bottleneck.