Actually, I had this problem with 7000 and 7022 as well.Insert DVDLaunch setup.exe from within Win7 7048Click "Install Now"Almost immediately I get: "Windows Setup cannot find a location to store temporary installation files. To install Windows, make sure that a partition on your boot disk has at least 688 megabytes (MB) of free space. Error code: 0x80070490" I've done a full day of searching for more info online and really haven't found anything that relates to Win7. I have done the following: Verify available space on C: (which is over 400GB free) Checked permissions and ownership on temp folders (although it was never changed from the initial install) Launch setup.exe as Administrator The install will work if I boot from DVD but will not perform an upgrade, of course. However, a full install is possible to the same or secondary hard drive. Any ideas are welcome.