CRC of MBR or UEFI boot loader changes at every restart?
I have a Fujitsu Esprimo desktop running Windows 7 Professional.
Every time I restart, it stops before loading Windows with the following message:
"The CRC of the boot drive MBR or UEFI boot loader has changed since last boot.
Press any key to enter setup."
In order to continue, I have to go into BIOS setup, exit without any changes, then Windows loads normally.
This repeats at the next restart.
I have run chkdsk on the system drive (C:), and no problems were found.
What would cause this, and how can I change it?
Solutions to the Problem CRC of MBR or UEFI boot loader changes at every restart?
I've never enabled this setting on my laptop.
I'm not certain exactly what it's checking - whether it's just the MBR or other things like Bootmgr and BCD.
On a system with only Windows 7 installed I wouldn't expect the MBR or Bootmgr to change after installation.
Did this start after an update? The Reliability Monitor may show any changes with occurred around the time this started.
I assume the Fujitsu support have checked that you have the most up to date BIOS.
Have you tried disabling the virus warning and then enabling it again in case it needs resetting? Even if it is a boot virus, I wouldn't expect it to be constantly changing
so as to cause the detection at every boot.
If you want to eliminate this possibility, it's best to use an offline virus scan like
Windows Defender Offline.
An outside possibility is that Webroot is doing something clever with these files that is causing the problem.
You can reset the MBR and Bootmgr using the method here:
Windows Restore - Totally Fix All Errors including CRC of MBR or UEFI boot loader changes at every restart?
- Click on the Start button on the Taskbar.
- Type "System Restore" (without quotes) in the Search box and hit Enter or,
- Click on System Restore (when you see System Restore pop up in the list of search results).
- Make sure the "Recommended restore" radio button is checked on the restore utility window.
- Click on Next and follow the instructions given.
Note: There is the option on the restore utility to select "Choose a different restore point". Unless you have a specific reason to select a different date and time than what Windows recommends, just select the recommended option stated in the steps above. If you choose to select another one, follow these steps:Click on that desired date and time, and Windows 7 will perform a scan for any affected programs in that restore point.
Once completed, click Next and follow the instructions given.
Once you have selected the restore point, your system will start the restoring process, after which you will have to restart the system.
Another Safe way to Fix the Problem: CRC of MBR or UEFI boot loader changes at every restart?:
How to Fix CRC of MBR or UEFI boot loader changes at every restart? with SmartPCFixer?
1. Click the button to download Error Fixer . Install it on your computer. Open it, and it will scan your system. The errors will be shown in the scan result.
2. After the scan is done, you can see the errors and problems need to be fixed. Click Fix All.
3. When the Fixing part is done, your computer has been speeded up and the errors have been removed
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