LUANDA (Reuters) - Angola s first new president in almost four decades vowed to rebuild an economy devastated by falling oil prices and fight corruption at his inauguration on Tuesday. Jo o Louren o told thousands of supporters in Luanda he would also tackle gaping inequality in Africa s second largest oil producer - though analysts have already raised doubts about his ability to make far-reaching change.  No one is so rich and powerful that they cannot be punished and no one is so poor that they cannot be protected,  he said to loud applause. In a 45-minute speech, Louren o said he would strive to bring in reforms covering gender equality, the freedom of the press, private enterprise and public health.     Former president Jose Eduardo dos Santos remains head of the ruling MPLA party, giving the veteran leader influence over key policy decisions. Any serious attempt to transform the country could put Louren o on a collision course with senior party figures and powerful interest groups. Angola s economy fell into recession last year, while unemployment is officially over 20 percent and a shortage of foreign currency has forced firms to pull back operations. Louren o said he would work to reduce state intervention in the economy and give free enterprise the space and support to thrive. He has previously said he does not rule out negotiating a deal with the International Monetary Fund or World Bank to help rebuild an economy heavily reliant on oil.  There are enormous challenges before us ... We call on the help of everyone on this difficult journey,  he said. 