I have graduate degrees in business and law. As COO of a software
company I now realize I need much more knowledge in computer science
than the courses I had at university. I am therefore looking for the
following:
- top-tier university in US/Europe
- 1 year masters program with focus on computer science
- program that doesn't require a bachelor's in engineering or has a
possibility to waive this restriction
The difficulty in answering this question lies in the fact that most
programs are conceptually designed to work the other way around:
people first get an engineering degree and then an MBA - I want to do
it the other way around.

I sympathize with your situation but you need to understand that you
don't have the language skills necessary to gain a legitimate masters
in computer science.

The problems lies in mathematics, the language of computer science and
most sciences, as well as engineering.

Unless you are pretty comfortable with abstract mathematics such as
number theory, legitimate graduate degrees in computer science are
probably not accessible to you.

I will look into this for you but don't hold out much hope, have you
checked with U phoenix and the harvard extension school?

Thank you for your comment - I do recognize this as a potential
obstacle to admission. I obtained my graduate business degree in
Europe where a number of advanced courses in mathmatics, statistics
and quantative methods are required for graduation. Nonetheless, it
has been 10 years since I completed these courses and I would need to
refresh and probably also strengthen my knowledge in this field. Maybe
this could be solved with "pre-enrollment" credits or an intensive
course?
BTW, thank you for suggesting the Harvard Extension School. This may
be a viable option.

I've looked at the curriculum of the Harvard math courses and
(although its been a while) I've covered most of the topics in the
following courses:
MATH E-3 Quantitative Reasoning: Practical Math (Fall, Spring)
MATH E-6 Mathematics and the Greeks (Spring)
MATH E-8 College Algebra (Fall, Spring)
MATH E-9 Functions and Graphs: Introduction to Precalculus (Fall)
MATH E-10 Precalculus (Fall, Spring)
MATH E-15 Introduction to the Calculus A (Fall, Spring)
MATH E-16 Introduction to the Calculus B and Differential Equations (Fall, Spring)
MATH E-21a Multivariable Calculus (Fall)
MATH E-21b Linear Algebra (Spring)
MATH E-102 Sets, Counting, and Probability (Spring)

http://www.extension.harvard.edu/2004-05/courses/math.jsp#e-10

Where does that put me in the requirements list?