Connecting DAV-DZ100 (Sony) to PC

I am the owner of a DAV-DZ100 Dony Home Theatre System and i love it.
but i hate the fact that i have to burn a cd/dvd before i can play it with decent sound.
the cables that the player use are rather strange ^^
i AM a noob on this area so i will just give some links on how the cables look like.
heres the one that goes into the DVD-player (but i want to connect it to my pc)
http://img149.imageshack.us/my.php?image=inputnc9.jpg

and this one goes into one of the speakers.
http://img149.imageshack.us/my.php?image=outputrj7.jpg

i just wonder if it is possible to get some sort of device to connect my 4 speakers and subwoofer (all have the same type of cable) to my pc…
and connecting dvd to pc wont work. i just want to connect the speakers =D

thanks in advance.