Tried to dual boot windows 7 and windows 10, can access 10 fine but i cant use 7.

[iusepc]

I (stupidly) attempted to dual boot windows 10 and windows 7, for the sake that, I could test out windows 10 while keeping my old OS. it installs fine, I boot into windows 10 and everything was good. I restart my pc, click windows 7 and it comes up with the recovery section. I use the automatic solution, it says it cant find anything wrong with windows 7 boot (I start getting worried at this point). I boot back into windows 10, and i find out that when I installed windows 10 (on the same hard drive as windows 7) it had overwritten windows 7 drive letter. I'm assuming that the drive letter being changed is the source of the problem. however, when i try to change the drive letter, it errors with "incorrect parameter". I'm guessing this is windows not letting me overwrite the current drive letter. basically i need to change windows 7 drive letter.


TL;DR tried to dual boot win 10 and win 7, win 10 messed up win 7's drive letter, need to find a way to change it

 

[Scibility]

have you tried system recovery? or reverse the upgrade? theres a option in windows 10 that you can reverse the upgrade within a month of the install, once done that burn windows 10 on a cd and make a second partition upon reinstalling. hope this helps

 

[iusepc]

have you tried system recovery? or reverse the upgrade? theres a option in windows 10 that you can reverse the upgrade within a month of the install, once done that burn windows 10 on a cd and make a second partition upon reinstalling. hope this helps

i probably should have included this, but it slipped my mind. the windows 7 is OEM and the windows 10 was downloaded from microsofts insider program. and ive tried system recovery but it didnt do anything :c

 

[Scibility]

My windows is in dutch, but heres where you should have a look. http://puu.sh/jiRrx/e9f3261f9d.png I'm sure if you click the reverse button marked red there it will reverse the your windows.

 

[iusepc]

My windows is in dutch, but heres where you should have a look. http://puu.sh/jiRrx/e9f3261f9d.png I'm sure if you click the reverse button marked red there it will reverse the your windows.

http://puu.sh/jiRVZ/4a9e939497.PNG
That is all i get, like i stated previously, i used a .iso i downloaded from windows insider

 

[Scibility]

i manually downloaded mine from https://www.microsoft.com/en-us/software-download/windows10 strange you dont have the option..

 

[iusepc]

strange indeed.

 

[iusepc]

windows 10 itself works, i just don't have a key and i cant use windows 7

 

[Scibility]

do you have windows 10 or PRO version btw? it could be that your gpu driver has changed since, if you have regular win10 which caused the invalid parameter error.

 

[iusepc]

i have windows 10 home edition. ill try updating my gpu driver

 

[Scibility]

windows 10 home edition gets you a automatic new gpu driver, thats probably why.

 

[James Mason]

The operating system you're using currently will ALWAYS use C: as the OS drive, it doesn't change it for the other operating system.
Did you create a separate partition for windows 10 before you tried to install it?
Did you install windows 7 first?
Did you actually buy a separate copy of windows 10, and not try to use the free upgrade, because you can't dual boot an upgrade.

 

[iusepc]

I Did indeed create a separate partition before installing windows 10. my windows 7 came preinstalled on my pc as OEM. and i downloaded windows 10 from the windows insider program.

 

[James Mason]

if you run msconfig and go to the Boot tab what do you see?

 

[iusepc]

http://puu.sh/jiVup/ffb98e023a.png

 

[James Mason]

http://puu.sh/jiVup/ffb98e023a.png

That looks like a proper dual boot.
Have you tried changing the default OS to windows 7?

 

[iusepc]

ill do it now

 

[iusepc]

it just goes straight to automatic repair when i try to launch windows 7.

 

[James Mason]

it just goes straight to automatic repair when i try to launch windows 7.

Well, tell it to try and boot up normally anyways.

 

[iusepc]

oh crap, accidentally clicked it as the solution. and ive tried to restore to a previous restore point, restarting. im going to see if moving windows 7 over to my other harddrive then booting the harddrive in BIOS

 

[James Mason]

oh crap, accidentally clicked it as the solution. and ive tried to restore to a previous restore point, restarting. im going to see if moving windows 7 over to my other harddrive then booting the harddrive in BIOS

FYI, you can't move an OS, only clone the drive/partition it's on to another drive.
Restore points usually only work the first time you're given the choice, after words it just restores to the last time you restarted/shutdown.

 

[EJ17]

I have a similar problem except on this screen http://puu.sh/jiVup/ffb98e023a.png it will ONLY show Windows 10. It won't show my Windows 8.1, 8 or 7. I'm desperate now.