Upgrade downgrade i dunno

[scoot52481]

Ok so here goes i tried installing leopard 10.5.2 worked fine except all i got was a blue screen so i installed 10.5.1 works for me done with that but i updated itunes and quicktime and now i cant update safari cause it calls for 10.5.6 i dont need it i tried 10.5.6 and when it rebooted it got a stupid restart screen and when i restart it keeps coming up that is why i stayed with 10.5.1 my question is i wanna know if there is anyway to install safari 4.0.3 without updating leopard cause really everything works fine except for that and if safari isnt updated i cant log into itunes store this is so stupid someone please help me thank you