The installation of QGIS 2.0 is fairly easy on Ubuntu but much easier using Windows as an operating system. The installer is very handy and is provided by the OSGEO4W project (Open Source Geospatial Foundation for Windows).
A short time ago I’ve posted an article on the installation of QGIS in combination with a PostGIS database in the background. As we all know, Windows is mostly used as OS on a PC so this is the Windowized version. This is a short summary that sums up the article of a site called Boston GIS. I’ll show you how to install QGIS version 1.8 (which will be updated in some days) and PostgreSQL with PostGIS extension and show you the first steps in the import of shapefiles and raster data.