How much money does the goverment or private corporations spends doing research on HIV/AIDS?

These organizations contribute increasing amounts of money to confront AIDS and other pressing global health issues. UNAIDS [8] reports that in 1996, approximately US$330 million was available for HIV/AIDS initiatives worldwide, a figure which had risen to US$4.7 billion by 2003. Although this represents a huge increase in funding, it is still less than half the amount of US$12 billion that is now required, and this exigency is expected to rise to US$20 billion by 2007.

not enough money

You can look up specific numbers spent by the government. You could also ask specific private corporations for the amount of money they spend on HIV/AIDS.
I don't believe the foremost problem is a funding problem. The private corporations first priority is to make a profit. The majority of politicians care about themselves first. I would venture to say helping people is at best their third priority.
The top HIV/AIDS researcher in the country understands what the combination of medicine and politics and the private corporate world is all about.