Windows 7 - change active partition when you can't log in

Posted on 2009-05-02
Last Modified: 2012-05-06
Hi guys.

I've got a PC with Windows 7 on it.  There was a partition created during a previous instance of Windows, and it wouldn't let me access it with this newer version, so I went into Disk Management and "messed round" a bit.

I inadvertantly set the problematic partition to be active and have since rebooted the PC.  Obviously, it's now trying to reboot from the partition that I was having problems with, and that's not a bootable partition.  So, no boot, no windows, and no PC!

Can someone please give me some help with this.  I really only (for now) need to get back to booting from the primary partition, and will solve the other problem at another juncture,#.

MANY thanks in advance guys.  Hope someone can help!

Question by:Jaymol
    LVL 59

    Accepted Solution

    Boot to your Windows 7 install DVD and go into the Windows Recovery Environment (which is what corresponds to the old XP Recovery Console for Vista and Windows 7.)  I believe you have to click on a link for Repair my computer to get to the Windows RE.  Go to the Command Prompt section.  Then you can use the List Partition command to see what partition you want to make active.  Then use the Diskpart Active command to set the proper partition active.  More info here:
    LVL 6

    Author Closing Comment

    I've never sworn on this site before, and I've been a suer for a LONG time, but you, sir, are a FUCKING GENIUS!!!!!

    Thank you :)

    Featured Post

    Why You Should Analyze Threat Actor TTPs

    After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

    Join & Write a Comment

    I hope this helps those who have been battling the SanDisk / U3 problem for a while. For anyone that is running Windows 7 64bit and is receiving and searching the internet for the “Windows Error: Windows has allocated a drive letter to the U3 dri…
    I recently purchased an HP EliteBook 2540p notebook/laptop. It has two video ports on it – VGA and DisplayPort. HP offers an optional docking station for the 2540p that also has both a VGA port and a DisplayPort. There are numerous online reports do…
    In this Micro Tutorial viewers will learn how to use Boot Corrector from Paragon Rescue Kit Free to identify and fix the boot problems of Windows 7/8/2012R2 etc. As an example is used Windows 2012R2 which lost its active partition flag (often happen…
    The viewer will learn how to successfully create a multiboot device using the SARDU utility on Windows 7. Start the SARDU utility: Change the image directory to wherever you store your ISOs, this will prevent you from having 2 copies of an ISO wit…

    754 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    21 Experts available now in Live!

    Get 1:1 Help Now