Hi...I hope someone can help/.

I am having trouble connecting the following so that they all work perfectly.
DELL STUDIO XPS PC RUNNING WINDOWS 7
MBOX 2
TYROS 2 KEYBOARD
STAGEPAS 500 PORTABLE PA SYSTEM

USING PROTOLS 9
I have been composing and recording using the above equipment but have been left by my technicion husband ,to struggle setting it all up by myself. Although i am musically trained and have a music degree I am absolutely clueless with the technical side of things DOH
I need a hero [ OR HEROINE] who can explain in laymans terms how to connect the
KEYBOARD---MBOX---SPEAKERS[PA]-----PC........and i mean real step by step instructions..sorry
I have had a go but its a wonder I haven`t blown the whole lot sky high.
I am desparate to get back to recording. I am not recording in midi mode.
Many thanks