Salvaging a dimarson DM-R300 5.1 home theater speaker set.

Hello guys.
Forgive me if i have posted this in the wrong forum. Unfortunately my dvd player/home theater 5.1 system has died.
The 6 speakers are in perfect condition though. So rather than buying a new one i thought of getting an amp for it.
Mainly because it would be a lot cheaper ( i suppose), and there is no reason to let the 6 speaker collect dust.
I tried to find something for the specification, but i had no luck.
My computers motherboard has 6 rca output, so i am looking for a suitable (preferably cheap) amp/crossover that could utilize my speakers.
The 4 corner speakers+center are 15W 6 ohm , and the Sub is 30W 4 ohm.
Any help is appreciated, thank you all in advance!