Why was a vaccine for the complicated new strain of Swine flu made in months but not for HIV/Aids?

For a vaccine all they need to do is inject a tiny amount of the virus for the body to build an immunity against it. So why does the government not make one for the HIV virus but the complicated swine flu that has 4 different strains from over 2 species - they popped out the virus over the summer practically instantly. Scam or ?