is there any C++98 compiler which works for Windows NT?

Question

I am working in a project which needs to run in a Windows NT, the application must be implemented in C++98. Currently we only have Visual Studio 6 but we are having many problems with basic syntax statements.

Do you known any alternative compiler which can comply with the c++98 standard and works in an ancient system as Win NT?

We already tested Watcom but is not usefull either...