First, put the original Windows 8/8.1/10 installation DVD into the disk tray and boot your computer from it.
If you are looking to repair Windows 10 or Windows 8 MBR, you can refer to the following content. ✍ If the above commands do not work, you can run the following command to export and erase the BCD store and use the Rebuildbcd command again to fix MBR Windows 7. Remove the installation DVD from the disk tray and restart your computer to check if it can boot up successfully. When Command Prompt successfully launched, type the following commands and press enter each time: In the "System Recovery Options" window, click on "Command Prompt". Select the operating system and click "Next". Select a "language", "keyboard layout" and click "Next". When the message "Press any key to boot from CD or DVD… "shows up, press any key to boot from the DVD.
Boot your computer from the Windows 7 installation DVD. First please put your original Windows 7 installation DVD into the computer's DVD or CD drive. If you have kept your installation disc, you can try to fix MBR in Windows 7 through Command Prompt.
How to repair MBR Windows 7? In general, the MBR repair requires the usage of a Windows installation DVD or CD. In such cases, you will have to fix MBR Windows 7 to make your external or internal hard drive accessible again and OS boot back to normal. If the MBR on your primary/main hard drive is corrupted, you won't be able to boot your OS successfully and receive various error messages including: If the MBR on the secondary hard drive gets damaged, you will be unable to access this drive as usual. It is created on the very first partition after Windows is installed, and it’s the first 512 bytes of your hard disk. The MBR (abbreviation for "Master Boot Record") is a boot sector (a region of your hard disk) that stores important information about the partitions of your hard drive and loads the operating system. What will happen if MBR is corrupted in Windows 7/10/11? How to repair Windows 7 MBR without CD/DVD? How to fix MBR in Windows 7 with Windows CD/DVD? What will happen when MBR corrupted in Windows 7? Does anyone know how to fix MBR in Windows 7. It just goes black because it just quits drawing the window.“Today, my computer with Windows 7 installed fails to boot, the error message suggests that the Master Boot Record on the main hard drive has gotten corrupted or damaged, and needs to be fixed.
It's actually so bad that I can't even load IE properly to load a web page.
The rate at which the window draws makes it very unclear though, I know it's normal for stuff to jump around a bit but when you can view it in real time it typically only stays on top for less than a second. svchost.exe and TrustedInstaller.exe and taskmgr.exe itself seem to be on top often. I can't say there's any one process that is using lot of CPU, it jumps around a lot and each time the window manages to refresh it's a different app. When I manage to get a task manager up, it's hard to make out what's going on as it jitters so much and only updates maybe once every 20 seconds. I gave it like 2GB of ram and 1 CPU, is this maybe not enough? Is there a way to fix this? I usually use XP when I need a windows VM, but it would be nice to use 7.
Trying to type something is near impossible.
Something as simple as getting a right click menu takes about a minute just for the menu to show up, moving a window takes several minutes etc. Is there a way to speed up Windows 7 in a VM? I am trying to use it in Virtualbox but it's completely unusable.