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Nurse - I'm sounding like a rep for richer sounds but they do have decent packages.
Just browse this:
http://www.richersounds.com/products/home-cinema/home-cinema-separates/home-cinema-systemsFor £200 you'll have a far superior setup compared to anything you can bodge with the old PC speakers.
Otherwise you will need to get an amp with separate channel pre-outs and adapters that go from Phono to 3.5mm stereo (for each channel) The cabling alone will cost about £40 -£60
Or are my speakers not worth the bother?