Musescore installation problem

Hi everyone,

In fact I need some help as I have trouble with installation of Musescore on windows XP.
I already had it (v1) then updated to v2 and it was not working anymore and now I can't manage to have any version working.
i also tested the SSE2 version of MuseScore without success...
i really don't understand as it was working before.
Thank you for your help.