dll is missing

Hi. I have a problem and I hopoe someone could help me. At my job we have 2 machines with the same instalations: Win NT 4.0 SP5, IIS 4 Option Pack. The first one is for the users (I don't know how to call it in Emglish, but we call it 'production machine' in Portuguese) and the second one os for development and tests. The only difference between both machines is that the development machine runs SQL 7.0 SP 1 too. When I try to run a php (I'm using PHP version 3.0.16), I've got the following message box: "The MSVCRTD.dll library was not found in the path c:\winnt...blablabla". When a click the OK buttons, the script go on. I searched this library on both machines but I couldn't find it. But exactly the same script runs on development machine and it works fine. I haven't got any message box at the development machine. Could someone help me?