After you have them you need to unzip, and thats it. If you dont have any unzipping utillity, search for WinZip, or pkzip. You should be able to find them as shareware.
To run Reducer, double click on it and it should start right up. If not double click GWBASIC and hit F3, type in reducer after the LOAD" line, and hit enter. You should then see "ok" and then you hit F2, and the program should start.