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damaged win 7 in a win 8 dual boot

In my acer 5755 laptop i have first installed win 7 in C: & later installed win 8 in D:. All was working perfectly until I did a boot scan with free avast in win 7. The scan stopped in the middle & the screen went black. I had to remove the battery as nothing responded. Then when i tried to boot, there was an infinite loop, but no dual boot menu. I did a win 7 CD boot startup & did startup repair. Now I can boot into both the OS's, even though there is a lot of flicker & if i choose win 7 it again shows acer logo, then boots. Win 8 is working perfectly (internet is fast too), but win 7 is acting slow, especially internet is worst hit. Webpages are taking eternity to open or do not open even in 3g (earlier which was extremely fast). I did sfc /scannow in win 7, but no joy. I am planning to reinstall win 7, but do not know if that will create any problem in my dual boot system. Please advice. Thanks in advance.
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  1. It shouldn't create a problem as long as it's installed on the same partition used for Windows 7 previously.
  2. J-Mello said:
    It shouldn't create a problem as long as it's installed on the same partition used for Windows 7 previously.


    Thanks, but my concern is- as win 7 was installed first & win 8 later, I was told that some startup & boot files are shared. So if I reinstall win 7 will it create problem for win 8? (i mean that is the good OS right now & I dont want to mess up)
  3. I don't think it would but i'm not 100% sure.

    I think you would essentially be replacing the boot files on the win 7 drive with a reinstall.

    Have you tried booting from Win 8 and using the CD to install win 7 on the C:
  4. It should be fine. I have a Win7/Win8.1 laptop.

    It used to be 7 & 8, and I installed a new copy of 8.1 (not just upgrade) the other day. All still works perfectly.
  5. J-Mello said:
    I don't think it would but i'm not 100% sure.

    I think you would essentially be replacing the boot files on the win 7 drive with a reinstall.

    Have you tried booting from Win 8 and using the CD to install win 7 on the C:



    No..not sure..concern remains- win 7 is the primary OS & win 8 is installed afterwards. Boot manager should be in win 7 partition. I guess bootmgr should be created in win 8 partition..
  6. USAFRet said:
    It should be fine. I have a Win7/Win8.1 laptop.

    It used to be 7 & 8, and I installed a new copy of 8.1 (not just upgrade) the other day. All still works perfectly.

    But you will find that my case is a downgrade (i.e. if clean reinstall of win 7 is done)
  7. kgcoolguy said:
    USAFRet said:
    It should be fine. I have a Win7/Win8.1 laptop.

    It used to be 7 & 8, and I installed a new copy of 8.1 (not just upgrade) the other day. All still works perfectly.

    But you will find that my case is a downgrade (i.e. if clean reinstall of win 7 is done)


    It's not a downgrade. You're just replacing a broken Win 7 with a new install of Win 7. As I just replaced 8 with 8.1. I imagine if I had just redone 8, it would have been no different.

    I think it should be fine.
  8. USAFRet said:
    kgcoolguy said:
    USAFRet said:
    It should be fine. I have a Win7/Win8.1 laptop.

    It used to be 7 & 8, and I installed a new copy of 8.1 (not just upgrade) the other day. All still works perfectly.

    But you will find that my case is a downgrade (i.e. if clean reinstall of win 7 is done)


    It's not a downgrade. You're just replacing a broken Win 7 with a new install of Win 7. As I just replaced 8 with 8.1. I imagine if I had just redone 8, it would have been no different.

    I think it should be fine.

    Have you considered the boot manager & MBR scenario? win 7 first installed. Later win 8 added. Win 8 is sharing the boot files..now if i clean reinstall win 7 after formatting C:, will the boot/startup files connect as before? Need some concrete info..
  9. Best answer
    It depends where the boot files reside.
    a) on separate hidden System partition
    b) on Windows 7 partition
    c) on Windows 8 partition

    In case boot files are on Windows 7 partition they will be deleted if you do a clean Windows 7 installation. So after installation of Windows 7 you can do a dual boot repair using the utility - it will place Windows 8 boot manager in control and create a Window 8 loader entry so you will have a dual boot choice on startup.

    In case a) and c) boot related files will not be deleted and eventually you will end up with 3 boot menu entries - one for Windows 8 and two for Windows 7. You can delete one of the entries for Windows 7 using Visual BCD Editor but you have to check which entry is actual - check the corresponding recovery loader(by GUID in element "RecoverySequence") is actual e.g. path to winre.wim exist.
  10. boyans said:
    It depends where the boot files reside.
    a) on separate hidden System partition
    b) on Windows 7 partition
    c) on Windows 8 partition

    In case boot files are on Windows 7 partition they will be deleted if you do a clean Windows 7 installation. So after installation of Windows 7 you can do a dual boot repair using the utility - it will place Windows 8 boot manager in control and create a Window 8 loader entry so you will have a dual boot choice on startup.

    In case a) and c) boot related files will not be deleted and eventually you will end up with 3 boot menu entries - one for Windows 8 and two for Windows 7. You can delete one of the entries for Windows 7 using Visual BCD Editor but you have to check which entry is actual - check the corresponding recovery loader(by GUID in element "RecoverySequence") is actual e.g. path to winre.wim exist.


    Thanks..will try Dual Boot Repair Tool first to check if I can get the boot problem solved. Do not want to reinstall win 7 (if possible) as it contains a few installed softwares..& there is internet problem too..let me check & revert back.
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