I was able to download what I thought was Windows 7 64 bit from Microsoft's Website. I Hated Vista 64 bit so bad that I really didn't care what damage it did. It works so much better that I can't believe it. Faster also. Here is my problem. I was able to install it over the top of Vista 64 bit. I have been reading that when you buy the Ultimate version that you will not be able to install it (full version or upgrade) over the top of anything. This is a problem for some of us who have preinstalled software and the drivers are not singled out on back up application CDs. My hope is that we can buy a full version Windows 7 Ultimate and install it over the top. Does anyone know? A couple of people here mentioned it may not install over the Win 7 Ultimate RC Candiate Many programs that would not work in Vista 64 bit work just fine in Windows 7 64 bit Ultimate I have cured one problem of Roxio 2009 as their patch for Vista 64 also works for Windows 7 64 bit. I have another problem with Office 2007. Powerpoint and Excel will not allow you to click on the user file, i.e. in Excel. The .xls file gives error: "There was a problem sending the command to the program". However Word 2007 works OK. The only program I have found that refuses to work is Family Treemaker 2006, Family Treemaker 2008, and then ONLY in the report functions that make a report in .pdf, xls, .rtf, etc... I have everything the way I want it and some of the software has not authorizations left so I dont' want to have to lay it back down again. Has anyone any answers for any of this???