For example you can o use device manager to roll back

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Boot into Safe Mode and then use the appropriate tool to undo any recent changes. For example, you can: o Use Device Manager to roll back drivers or disable devices that might be causing the problem. o Use Add or Remove Programs to uninstall software that has just been added. o Restore any settings that may have changed. o Disable unneeded services or applications that load at startup. o Use System Restore to restore the system to a known good restore point. After booting into Safe Mode, begin by undoing the most recent change to the system. For example, if the problem started after you installed a new device driver, roll back the driver and reboot. If undoing recent changes does not fix the problem, you could disable all unnecessary devices and services. If you can boot normally, you can identify which component was causing the problem by enabling devices and services one-by-one until the system becomes unstable. Using the bootrec Command 0:00-1:52
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In this demonstration, we're going to spend some time working with the bootrec command. The bootrec command is the ultimate repair tool if you're having problems with a Windows system that won't boot. Now, I have to point out that you should not jump right to the bootrec tool if you've got a Windows system that won't boot properly. Instead, what you should do is boot the system off of the operating system installation disk, which is what I've done with this system. Then go to Troubleshoot,and then go to Advanced Options. Then use the Startup Repair option first to see if Windows can figure out what the boot problem is. On rare occasions, this option will fail, in which case you'll have to manually fix the boot problem with the bootrec command, which is what we're going to do in this demonstration. This is a Windows 8.1 system I booted off my Windows 8.1 operating system disk. I've accessed my advanced options. What I need to do to run the bootrec command is access the command prompt. I'm going to click this option. Before I can access the command prompt I do have to authenticate as an administrative userso I'll do that using my TestOut student account. I have a command prompt now that I can work from.At the command prompt we can run the bootrec command. I'm just going to run bootrec without any options so we can see a list of things that we can do with it. For example, we can use the /FixMbr option to rewrite the master boot record. We can use the FixBoot option to write a new boot sector. We can use the ScanOs option to scan for all installations that could potentially be booted with the Windows boot loader. And we have the RebuildBcd option,which, as it notes here; "Scans all disks for installations compatible with the Windows boot loader and allows the user to choose which one they want to add to the boot configuration store. FixMbr Option 1:53-2:55 So let's begin by talking about how to repair the master boot record. This is done by using the FixMbr option that we looked at right here. To do this we type bootrec/fixmbr. This option will repair a corrupted or damaged master boot record on the hard disk drive. This option will repair a
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