Windows 7 suddenly stopped booting.

[FixUnknowErrors]

Hi!

In this form I hope to solve PC errors, thanks for the help everyone!

I've a lot of PCs, all of whom have Windows 7 Enterprise and XP dual boot.

Nowadays, suddenly in many PCs both the OSs stopped booting, but I'll query about Windows 7 in this forum.

When Windows 7 starts to boot, as soon as the 'glasses' of the Windows logo appears, Windows 7 reboots.

On booting from safe mode, the restart happens after classpnp.sys is loading/loaded. I tried renaming that file, but then the restart happens on disk.sys, on moving that file too, it happens with fvevol.sys.

I tried to enabling boot logging (from F8), but there's no ntbtlog file in the Windows installation directory.

Please help me solve this PC problem!

 

[Bumpkin]

Welcome to SevenForums!

You mentioned you have many PC's with the same problem. The first thing I would look for is any updates that were installed on the machines shortly before the problems started.

If the PC's have System Restore active you might want to boot using a Install or Repair disc and restore to an earlier date.

Also try running Startup Repair, http://www.sevenforums.com/tutorials/681-startup-repair.html You may have to run it three times, booting between each run.

I try to never touch any machines that are dual boot, sorry I don't really have a lot of suggestions.

 

[gregrocker]

Work through these steps for Troubleshooting Windows 7 Failure to Start

 

[FixUnknowErrors]

Sorry for the late response.

I was trying to fix some other errors.

I've tried all of what you've suggested, but there're no improvements; however I diagnosed the error code for which Windows 7 was not booting -- 0x7b, or boot device not accessible.

I suspect, for some reason, the driver configuration or the storage drivers which Windows 7 loads at startup have changed (maybe cause of a virus attack or a bad user); so how to I 'redetect' and enable the required drivers or enable all drivers? I'm talking about stuff in this place --

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services

Here I can see various chipset names with keys named 'start' to enable or disable them.

 

[gregrocker]

What disinfection did you do from boot? What did it find?

What were the results of Startup Repair and SFC /SCANNOW Run in Command Prompt at Boot?

 

[FixUnknowErrors]

What disinfection did you do from boot? What did it find?

What were the results of Startup Repair and SFC /SCANNOW Run in Command Prompt at Boot?

There was no infection (the PCs don't have any Internet connection) and SFC showed no bad files.

 

[FixUnknowErrors]

"A disk read error occurred" after changing partitions.

Hi!

After recent drive changes to my PC (split up a drive into 2), it wont boot.

I get "A disk read error occurred" followed by a alt+cntrl+del to reboot message.

I tried to fix the installation using the Windows 7 installation disk by repair startup, but nothing happened.

 

[gregrocker]

You split what exactly into two? Two separate HD's? Where is the Win7 partition in all of this? Is there a 100mb System Reserved partition and what happened to it?

Make sure the Win7 HD is set first to boot in BIOS setup, and is correctly detected under storage devices there.

Easiest at this point if you boot into free Partition Wizard bootable CD to take camera snaps of the full drive map and all listings. We'll be able to see what's happened much easier.

The 100mb or System Reserved should be marked Active, then run Partition Wizard Rebuild MBR - Video Help. If it fails to boot run Startup Repair - Run up to 3 Separate Times

 

[FixUnknowErrors]

That was a separate problem; this once is a separate one.

Anyway, don't restore that thread; I don't need it anymore.

I'd to 'reformat' again to fix this issue; there's no system reserve or boot partition in this setup. There's just 1 HDD which the BIOS can boot from and as stated before, I did do startup repair and fixmbr.

 

[gregrocker]

Then boot the Win7 DVD, during Custom Install delete all partitions and create/format new as shown in Steps 6/7 in Clean Install Windows 7.

Are you still using Win7 Enterprise and if so how is it being activated? It is meant or business or large organizations usually adminstered by an IT dept.