Using multiple-core processors with C++ apps on Windows XP

I'm new to the group and I have a console application written in C++ 
that I need to run on a system with dual quad Xeon processors. 
Unfortunately when it runs it uses only one of the eight cores, 
resulting in performance that is scarcely better than when it runs on 
a system with a single Pentium 4. The application was compiled with 
Borland C++ Builder 6.

Any suggestions about how to get it to use the other seven cores?

I would greatly appreciate some advice.





 
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