To be blunt, Malaysian degrees are not well recognised overseas, let alone Malaysian open university degrees.  If you are planning to work overseas, you must try to get a professional qualification which are recognised and accepted overseas.

For marketing, I would recommend the British based Chartered Institute of Marketing (http://www.cim.co.uk/home.aspx).  "The Chartered Institute of Marketing (CIM) is a professional marketing body based in UK with over 50,000 members worldwide. Based in Cookham  near Maidenhead, CIM offers professional development to marketing practitioners across the world. The objective of CIM is to raise the status of marketing onto a more professional and strategic level around the world."

For finance, you can look at the "Association of Chartered Certified Accountants (ACCA) is a British accountancy body which offers the Chartered Certified Accountant  (Designatory letters ACCA or FCCA) qualification worldwide. It is one of the world's largest and fastest-growing accountancy bodies with 140,000 members and 404,000 affiliates and students in 170 countries (as at April 2010)". (http://www.accaglobal.com/).

Or "The Chartered Institute of Management Accountants (CIMA) is a United Kingdom-based professional body offering training and qualification in management accountancy and related subjects, focused on accounting for business; together with ongoing support for members.

CIMA is one of a number of professional associations for accountants in the UK and Republic of Ireland. Its particular emphasis is on developing the management accounting profession within the UK and worldwide. CIMA is the largest management accounting body in the world." (http://www.cimaglobal.com/).

Or the UK based "The Institute of Chartered Secretaries and Administrators (ICSA) is an international professional membership body and a recognised authority on corporate governance." (http://www.icsa.org.uk/).

You can go through their foundation stages and many of their courses can be found at local private colleges in Malaysia where you can do them part time or in evening classes.  Or if you complete your Open University degree, use it for advance standing to skip a stage or two towards professional qualifications (that is if the degree is recognised by the professional body and this you must check with them).