For AMD laptop you need to boot with a modcd i used nawcom because you need a recent legacy kernel otherwise will not boot (freeze or kernel panic) .
Or you can use Virtualbox on windows7 and install retail 10.6 booting from bootcd1.6 .

For an old hp desktop i've used ipc 10.5.8 , plenty of option kernel and kext .
See if yours are listed here http://wiki.osx86project.org/wiki/in...0.5.8/Desktops