There are a lot of discussion about this issue in this forum. Try to search it.
Basically it is because your PATH is not set to Visual Studio.
You can set it by running vcvars32.bat or set it manually in the Control Panel.
Thanks. Now that the problem's gone, it appears I've installed the old SDK which should be the newer FP2. And I just typed the command wrong, should be ".....winscw.....".