When installing a (new SATA) hard drive is not recognized. I had to cheat (using fdisk). Then install properly and quickly. Windows 7 is stable and a significant improvement in the integration of memory over 3 GB, and speed: fun (says an old XP Prof-users). For special devices (USB-Serial Adapter, ancient telephone system), it is troublesome to find an appropriate driver. But here there are really good tips that also work then. Conclusions: Changing from XP no regrets recommended.