I tried several times to upgrade from win7. It will only open "automatic repair" when it is finished and should boot. It later rollback to win7. Any suggestions? I disabled AHCI but it didn't help.
How did you attempt the upgrade? By rebooting and using the iso or by using the setup.exe from within Windows 7?
I gave up on thrying to get Windows 7 x64 Pro to upgrade, have tested on 4 complete different Systems. Acer, Dell, Toshiba and Home Brew Generic OEM. v9926 is a far cry from being released, and to ask None Techy to do this with a "Patch" is ludicrus, hell they can not patch the upgade defect. M$ is "worthless" on this NEW CRUD, called Windows 10 TP, I am sure glad they placed the Full Windows 7 for everybody to get... I wonder how to do that if Windows 10 cause a massive Cluster F****.
Hahaha... You admit in your post it is a Technical Preview, meaning it's meant for those who know the inner workings or have idea of Windows 10 operating system, ready to test it and report bugs. I can't believe you claim it is worthless when it's clearly a work in progress.
Suggestion: If you have Win8 then upgrade 7x64 to Win8.1x64--that works perfectly--I've done it several times on several different machines. Then create a separate boot partition (preferably on the same physical drive where you have your Win7x64-to-8.1x64 installation), download the 9926 .iso, burn it, and clean install Win10 to the partition you made for it. This will automatically create a Win10/Win8.1 boot menu, from which you can dual-boot at will. Things to remember: *Win10 is currently a very beta OS and is ~4-6 months away from RTM. Win7 by comparison is very mature and hit RTM several years ago. *Both Win8.1 & Win10TP are designed to operate in UEFI environments--whereas Win7 is not. Win8.1/Win10TP can operate in "legacy" mode if need be--don't know what sort of bios your systems have. I'm guessing probably not UEFI--which isn't required for 8.1/10TP, but is highly recommended. *If any of your systems is UEFI, then outside of legacy mode operation, you'll need to create a GPT partition/disk to install to for either 8.1 or 10TP. *"Acer, Dell, Toshiba"...are these laptops or desktops?--you don't say. If laptops, be advised that you need at minimum 8.1x64 device drivers for Win10TP as 7x64 drivers may not operate either properly or at all. Normally, the Win10TP installation should provide you with enough hardware drivers to allow you to at least boot and connect to a network, but the caveat is that laptops often require slightly custom drivers only obtainable from the OEM--so check your OEM sites to see if any 8.1x64 drivers are offered for your hardware. Desktops are generally standardized pretty well, so the 8.1x64 drivers in Win8.1 should work fine with most desktops to get you up & running. *"Home Brew Generic OEM"...doesn't really say a whole lot... Basically, 8.1 and 10TP have much more in common with each other than Win10 has in common with Win7, interestingly enough. To install either 8.1 or 10TP you will need to do your homework in advance if you want optimum (or even workable) installations of either 8.1 or 10TP.