(-) So first hurdle: Whoever acquires the PC without an operating system and install Win 7 will select (and there are good reasons!), The need to press after power on F1 and the boot menu "Legacy only", otherwise Win7 is not loaded, because the devices (BIOS ) are set to win 8 / Win 8.1 has been available since 2013 (and therefore also the DOS commands do not work!). Otherwise, there are no problems: (+) The Win7 drivers are incidentally very easy to find: just on the Lenovo website "Q190" type into the search window and to support (support) click ... The old review that says otherwise, is - at least now - clearly wrong! (+) The performance of the configuration with an Intel Celeron Dual Core convincing amazing (Full HD) performance and stays very cool and quiet, for a PC. (+) The workmanship is very good, upright installation or flat very convenient and the design of the "smallest desktop in the world" speaks for itself ... Conclusion: (A real insider tip) ***** => Absolute recommendation