The easiest method of installation is to download and run the QSE installer. This may be downloaded from http://sourceforge.net/projects/qse/files/. You want the "qse-setup-msvc-x86-x.y.z.exe", "qse-setup-msvc-x64-x.y.z.exe" or "qse-setup-mingw-x.y.z.exe" file.
Download and execute this program - a Start Menu entry for QSE 0.5.0 will be created. To remove QSE, simply run the "Uninstall QSE \projectnumber" from the same start menu entry.