Compaq presario SR1155AP

topday htis computer of mine that follow me for almost 3 years has let me down. where can i find the microsoft bus driver. because the original operating system is windows xp home. but i wish to change it to windows xp professional. i tried it yesterday night but my sound is not working so i find the correct driver and loaded in. THEY GIVE ME A FUCKING WARNING BOX CALLED (MICROSOFT BUS DRIVER MUST BE LOADED IN YOUR SYSTEM BEFORE INSTALLION ) THEN THE WHOLE INSTALLION FUCK UP AND STILL HAVE NO SOUND.wheni surf the intel with fidnign of the microsoft bus driver they all give me crap and more shitting answer all are link to microsoft CE. wat the fuk is this

i hate microsoft windows xp home
the best is microsoft windows xp professional