gfx card - very good. a bit overkill for minecraft though.
cpu - decent. overclocking might be needed for more demanding games.
os - why xp 64? imo windows 7 home premium oem 64 bit would be better.
psu - haven't read good things about viotek/viotech.
cpu cooler advised, in case you overclock. make sure it fits your case and the rest of specs.
Overall, if the power supply does not blow up or fail and ruin your other components, you will have a decent mid level rig. Also good luck with the Biostar motherboard. Also no very good I'm afraid. And unfortunately, the low end AMD CPU will drag down the performance of the 560 Ti card slightly. The ram is very good though.
Wish I had better news, but I think honesty is a better policy.