Cannot boot into Windows 7 after installing Windows 10 Tech Preview


  1. Posts : 4
    Windows 7 Home Premium 64bit, Windows 10 Technical Preview 64bit
       #1

    Cannot boot into Windows 7 after installing Windows 10 Tech Preview


    So recently, I've installed Windows 10 on a separate partition on my 500 GB hard disk that's about 40 GB, and it works perfectly. Except that I can't boot back into Windows 7.


    All of my files are still accessible and working, I just can't actually boot into the OS. When I attempt to through the Windows 10 boot screen, first it reboots, then it goes to a black screen with 8 short lines of bright blue pixels on the top left. After a couple of moments, multi-colored pixels start appearing and changing all across the top couple of lines of pixels. This happens in the course of about a minute or so. I usually give up and turn it off cause I notice there is obviously something wrong.


    Is there anything I could do to fix this? I've looked everywhere to see if anyone had this problem, but I couldn't seem to find anything.


    Thanks in advance!


    PS: This is my first time using this forum, so excuse my nooby mistakes.
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  2. Winuser's Avatar
    Posts : 7,050
    Windows 10 Pro Insider
       #2

    I would give it a few more minutes and see what happens.
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  3. Charlie's Avatar
    Posts : 719
    win 7 dual boot / 10
       #3

    Lots of good info in the tutorial section. Try finding what you need here https://www.tenforums.com/tutorials/2...dows-10-a.html
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  4. Posts : 4
    Windows 7 Home Premium 64bit, Windows 10 Technical Preview 64bit
    Thread Starter
       #4

    Winuser said:
    I would give it a few more minutes and see what happens.
    Alright, I waited a little longer and it just rebooted. Still nothing.
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  5. Slartybart's Avatar
    Posts : 3,502
    Win_8.1-Pro, Win_10.1607-Pro, Mint_17.3
       #5

    Try this: Startup Repair - Windows 7 Help Forums
    also read this one: Startup Repair - Run 3 Separate Times - Windows 7 Help Forums

    Here is a general trouble shooting guide for when Windows fails to boot.
    Troubleshooting Windows 7 Failure to Boot - Windows 7 Help Forums

    Read though all of the tutorials, ask any questions before you act (that saves time sometimes - even if you have to wait for a member to reply )

    It almost sounds as though your GPU driver is wonky.
    then it goes to a black screen with 8 short lines of bright blue pixels on the top left. After a couple of moments, multi-colored pixels start appearing and changing all across the top couple of lines of pixels

    When did you install Win10? There were some reports of a bad update last week or the week before. I didn't have any issues on my machine (HP laptop), but I don't think I fired up the Win10 machine until after the update was pulled/repaired. Sorry I don't have the KB mentioned.

    I'm not sure how to go about fixing a device driver when you cannot boot up - there's a way, I'm sure ... I just don't know it.

    I'll look around to see if I can't locate the reference to the 'bad' update. At lease then you could check to see if it's on your machine.

    There's also a good
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  6. AddRAM's Avatar
    Posts : 3,990
    Windows 10 Pro x64 21H1
       #6

    Someone mentioned hiding the Windows 7 letter from within 10, try that then re boot.

    There`s a thread on it.
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  7. Posts : 4
    Windows 7 Home Premium 64bit, Windows 10 Technical Preview 64bit
    Thread Starter
       #7

    Slartybart said:
    Try this: Startup Repair - Windows 7 Help Forums
    also read this one: Startup Repair - Run 3 Separate Times - Windows 7 Help Forums

    Here is a general trouble shooting guide for when Windows fails to boot.
    Troubleshooting Windows 7 Failure to Boot - Windows 7 Help Forums

    Read though all of the tutorials, ask any questions before you act (that saves time sometimes - even if you have to wait for a member to reply )

    It almost sounds as though your GPU driver is wonky.
    then it goes to a black screen with 8 short lines of bright blue pixels on the top left. After a couple of moments, multi-colored pixels start appearing and changing all across the top couple of lines of pixels

    When did you install Win10? There were some reports of a bad update last week or the week before. I didn't have any issues on my machine (HP laptop), but I don't think I fired up the Win10 machine until after the update was pulled/repaired. Sorry I don't have the KB mentioned.

    I'm not sure how to go about fixing a device driver when you cannot boot up - there's a way, I'm sure ... I just don't know it.

    I'll look around to see if I can't locate the reference to the 'bad' update. At lease then you could check to see if it's on your machine.
    Yeah, I just installed Windows 10 two days ago, actually, so I'm pretty sure I didn't get the bad update you're talking about. Maybe.

    I'll definitely look at the tutorials you linked and see if they help.
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  8. Charlie's Avatar
    Posts : 719
    win 7 dual boot / 10
       #8

    Did you try start up repair in the link I posted?
    Cannot boot into Windows 7 after installing Windows 10 Tech Preview-start-up-repair-win-10.jpg
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  9. Posts : 4
    Windows 7 Home Premium 64bit, Windows 10 Technical Preview 64bit
    Thread Starter
       #9

    Ok, kinda weird, but it just booted. All I did was load the boot menu, choose the HP option, and it worked. When I tried that before, It showed me the option to go into Safe Mode, and I got it to successfully boot into that, so maybe something happened in-between that made it miraculously work?

    I'm going to reboot normally, and if it doesn't work, I'll keep trying. Thanks everyone for the help. I really appreciate it.

    Charlie said:
    Did you try start up repair in the link I posted?
    Cannot boot into Windows 7 after installing Windows 10 Tech Preview-start-up-repair-win-10.jpg
    I did try that, but it asked for an administrator password for the account, and no account was listed.

    EDIT: It booted! I don't know how it's fixed, but it is. Again, thanks everyone!
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