Praise be to Allah.
We have previously discussed the idea of an economic boycott and its importance, and that it is a kind of jihad against the enemies of Allaah. That was in the answer to question no. 20732.
In certain circumstances there may be reasons why Muslims can engage in business with non-Muslims, some of which have already been discussed in the answer to question no. 6699.
We may add here: that if the American or Jewish product is beneficial to the Muslims, and it is not possible to obtain it from Muslim companies or Muslim countries, then there is nothing wrong with buying it, especially if the computer program or technology will benefit the Muslims in other ways and is not simply a product that will be used up.
If you hope to gain knowledge and experience from your studies in the computer science institute, then there is nothing wrong with you continuing to study there and benefitting from the program offered in the institute. Similarly there is nothing wrong with you specializing in data entry using Oracle.
Let your intention be to benefit the Muslims, and to try to make the most of any branch of knowledge that enables you to do so.
And Allaah knows best.