I've been trying to get qtcreator working for me for a while now. After doing a fresh uninstall and reinstall this morning I was able to at least get qtcreator to call the compiler. As I had to leave my pc I closed qtcreator. When I returned and opened it again I get 'No valid Qt version set' even though the paths are valid. I was getting this error before and reinstalling worked, but only for one session, not I get this same error again. I've looked over the archives but couldn't find anything concrete, just a whole lot of stabs in the dark. Another strange thing is that the first time I launched after reinstalling I was able to set my mingw directory in tools/options. After starting qt for the second time I no longer have the option to set my mingw dir? Any help is much appreciated.