Discouraging foreign investment is hardly the route to prosperity.
The problem Argentina faces is that foreign investment requires, at some point, the repatriation of funds and profits to the investors homeland... for example, investors may wish to take their money back or may wish to spend the dividends on shares in another country. A strange concept I know (joke) but a difficult one for the government to manage as they closely control capital inflows and outflows. They even consider foreign invested money as the property of Argentina.
They don't want foreign investors to rip them off either and take over their country which is fair enough but they struggle to find a balance between attracting investment and honouring agreements they make with international investors. They don't want to become slaves to debt like IMF supplied funds (who would gladly lend to Argentina if asked at super high interest rates) which I can understand but they make it very hard for individuals to trust them. This means that foreign money is very expensive for Argentina as the risk of default is always high (government and corporate bonds). As governments change, the attitude towards investors radically changes and this scares foreign investment as no investor likes an unstable economic environment.
To make lives better for the average Argentine, here's how Argentina can help itself:
1. The government needs to be seen to be less radical and more predictable. This will make Argentina a more attractive investment destination
2. Take steps to eliminate corruption at all levels with strict penalties for corrupt government officials
3. Ensure greater separation between the executive, legislative and administrative arms of government. The executive control over the legal system must be reduced
4. The legal system needs to be made more efficient. Commercial law here is a mess and takes forever to resolve issues.
5. Government department expenditure must be transparent - all contracts and expenses must be made public for citizens to examine
6. Stop manipulating the INDEC, specifically inflation figures and currency exchange rates - floating the peso is a good start
7. Improve the electoral system so that buying votes for $$ is banned. Introduce a registry of political donations so that the average Argentine can see who is financially 'supporting' the government and any political party, member, senator and minister.
I could go on but this would be a good start. The trickle down benefits would soon help the average citizen to live better lives.