I don't know of any quick fix (I suppose installing a new os instead of win32 isn't possible). I can only agree with the others: write a single-threaded program with select (or poll or epoll).

(If you insist on a multi-threaded program, you'll have to use a program with a more lightweight thread modell, as you'll need many threads. Try ruby, bigloo scheme, python, or (and I hate to say this) java.)