System files integrity check and repair failed-error code 0x490

Original Title: windown 7 start up repair failure


Windows 7 Star Up Repair could not repair my computer automatically.  Root cause found - boot critical file f:\windows\system32\drivers\vmstorfl.sys is corrupt- boot critical file f:\windows\system 32\drivers\ksafedisk.sys is corrupt- file repair failed error code 0x2 - system       files  integrity check and repair failed-error code 0x490. No  system  restore  point available.  Kindly advise remedial action.


Question Info

Last updated May 7, 2020 Views 40,650 Applies to:

Hi C Gangadharan,


1.       Are you able to boot the computer successfully after performing startup repair or the computer is in non-bootable state?


If you’re able to boot the computer successfully on to the desktop in normal mode, then I try the steps mentioned below.


Method 1: Put the computer into a clean boot and then check the CPU (Central Processing Unit) usage.


A clean boot helps in eliminating software conflicts. Visit the link below to know how to put the computer into a clean boot in Windows Vista.

Note: Once the troubleshooting is done, do not forget to put the computer back to normal startup.


Method 2: Perform a system file checker


The System File Checker tool (SFC.exe) scans for missing or corrupted system files and repairs them.


Method 3: Start your computer in safe mode with command prompt with the help of the following article and then perform the following steps:


Perform a check disk operation

 a.   In the command prompt, change the location to c: and then type chkdsk /r and press Enter.

Note 1: Answer Y when chkdsk asks you if you want to check the drive next time Windows boots (restarts).

 Note 2: /r = The /r switch tells chkdsk to attempt to recover any bad sectors of the hard drive if any are found. A bad sector is a spot on the hard drive that cannot hold saved data anymore. If you’ve any data on that sector, you’ll lose that.


Method 4: Rebuild BCD using the Bootrec.exe tool.


To run the Bootrec.exe tool, you must start Windows RE. To do this, follow these steps:

a.       Put the Windows Vista or Windows 7 installation disc in the disc drive, and then start the computer.

b.      Press a key when you are prompted. Select a language, a time, a currency, a keyboard or an input method, and then click Next.

c.       Click Repair your computer.

d.      Click the operating system that you want to repair, and then click Next.

e.      In the System Recovery Options dialog box, click Command Prompt.

f.        Type Bootrec.exe, and then press ENTER.


Refer the following link for more information:


How to use the Bootrec.exe tool in the Windows Recovery Environment to troubleshoot and repair startup issues in Windows


Let us know if this helps.

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