The most weird thing is happening to me: I have a hp notebook which has no internal DVD drive, so I installed via an external USB LG Blueray burner.
- First I installed Windows 10 customer preview into one partition.
- Then I installed Windows 8 into another partition.
All works fine. I have dual boot computer where I can test my software on Windows 8 and 10.
The computer has the following partitions:
- Recovery partition (300 MB)
- EFI System partition (100 MB)
- Data partition (400 GB)
- Windows 8 (40 GB)
- Window 10 preview (40 GB)
I repeat: All works fine. Neither the installation of Windows 8 nor 10 preview produced any problem.
Now comes the most weird thing that I have seen: As the final Windows 10 is out now, I wanted to replace the Windows 10 preview with the final Windows 10.
I boot the installation DVD, after a while comes the screen where I can select the language. Then comes a screen with a button in the center that says "Install Now" and then comes a message "Setup is starting".
Up to here all fine. But then comes a strange error:
A media driver your computer needs is missing. This could be a DVD,USB or hard disk driver. If you have CD, DVD or USB flash drive on it, please insert it now.
Note: If the installation media for Windows is in the DVD drive or on a USB drive, you can safely remove it for this step.
First: this error is not understandable. Second: It does not make any sense. When setup was already running up to here this means that it CAN read the DVD. So what driver should be missing?
Some people reported similar problems with Windows 7 where the cause was that it did not boot from a USB 3.0 port. But this cannot be the culprit because
- Windows 10 does not have this limitation anymore.
- I tried all the 3 existing USB ports and all result in the same error.
- I installed the Windows 10 preview with the same Blueray burner on the same notebook. Why does the preview find the driver and the final not?
I came to the conclusion that this is -once more- a wrong error message. The cause must be elsewhere.
Then I made a very interesting test:
I booted from the same Windows 10 preview DVD that I installed a month ago. And voilá: It also does not boot anymore. But it gives another error:
On a black screen it tells me
CDBOOT: Couldn't find BOOTMGR
No bootable device -- insert boot disk and press any key.
How is it possible that the SAME DVD, that I installed successfully one month ago, now throws an error ?
Then I made a third test: I booted from the same Windows 8 DVD that I installed before. And this is the only DVD of the 3 DVDs where I get up to the menu which allows me to select the parition into which I want to install.
- Win 10 final DVD fails with one error
- Win 10 preview DVD fails with another error, although it worked before!
- Win 8 DVD runs correctly
It is clear that this is
- Not a hardware problem: same notebook, same blueray burner, both Windows still run perfectly.
- No driver is missing because both Windows were installed without problems before.
- The DVDs are not burned wrongly, they worked before.
For me the only explanation is that the installation of Windows 8, which I installed after Windows 10 preview, destroyed anything on that computer.
Nevertheless both OS still run without problem, it is only the installation which is blocked.
But what has happened? Are there any diagnose tools? Has anybody seen such a strange thing before? Does anybody know a workaround (except deleting all partitions and starting from zero)?