introduction
Please read this if you have troubles to install Qt on Windows.
download
Download an older Version 4.5.3 of Qt from the ftp archiv:
ftp://ftp.qt.nokia.com/qt/source/qt-win-opensource-4.5.3-mingw.exe
Doubleclick this file to start the setup program.
MinGW
Select MinGW. The souces are not necessary.
download MinGW
Select "Trolltech" to download MinGW, there is only one option.
finished
After a successful installation of Qt your rootfolder contains "MinGW" and "Qt".