I did a clean install of Windows 7 Ultimate 64-bit the day I got my m17x, since it shipped with Windows 7 Home Premium. The install went smoothly. I deletd the partitions on the hard drive then recreated them and installed Windows 7. Once completed, I installed the chipset, video, audio, NIC, wireless, BT, Ricoh, and several other drivers. Once completed, I still had a device in the device manager, listed as a "coprocessor". I right-clicked on the "coprocessor" entry in the device manager and clicked to update the driver. I pointed the updater to the folder where the chipset driver had extracted to, and it installed the nForce driver. Mine has run flawlessly since reinstalling, except for some weird video issues while on java-heavy sites, like facebook when the 280m's were disabled. I disabled the 280m's and loaded the latest 9400m driver from the nVidia site, and now my video is flawless with or without the discrete video enabled. My Windows Experience Score for graphics is 6.4 with the 9400m and 7.2 with the 280m's.