Cannot Boot - Hang on Windows Logo

Thanks for reading. My laptop has mysteriously stopped booting as of last Saturday. I suspect it may be because I had stopped a windows update (I cancelled it while it was running and then it hung during shutdown).

When it hung during shutdown, I had to hard-power it off to turn the machine off. Once I did that, it would not get past the Starting Windows logo screen.

I've tried all the steps listed here: Troubleshooting Windows 7 Failure to Boot

with mixed results.

1) I tried booting into Safe Mode to no avail. It would previously hang on "avgidsha.sys" file.
2) I managed to get it to boot with Kaspersky's Rescue 10 Boot CD, and scanned my system. It found no viruses or malware on the system. I renamed all the avg-files in system32/drivers.
3) When I boot into Safe Mode, it hangs on Classpnp.sys.
4) I tried using a Windows 7 install CD and a Windows 7 USB boot CD, but neither one could boot past Windows 7 logo "Starting Windows."
5) I loaded the Partition Wizard onto a USB and loaded fine. The 100mb system partition was already active and I tried to restore the MBR.
6) I still can't boot past the Windows 7 logo.

Any other suggestions would be welcome! I was able to rescue all of my critical data off the HD when I managed to boot it with Kaspersky's Rescue 10 Boot CD onto a portable USB HD, but I'd like to be able to fix the issue if possible.

My last resort is to use PW to wipe the partitions and then see if it will boot of an install CD or bootable USB - but right now, because I can't get past the Windows Logo even with an install CD or bootable USB, I can't do a re-install unless I wipe the partitions (I'm hoping wiping the partitions will at least allow me to re-install).

Any thoughts or other things to try would be greatly appreciated.

Thank you!

avgidsha.sys is AVG IDS Application Activity Monitor Helper Driver. Classpnp.sys is SCSI Class System. So it may be that some startup entry is blocking windows to boot, or blocking disc activities.

Have you tried the bootable scan suggested in Troubleshooting Windows 7 Failure to Boot, using Windows Defender Offline? If not, do it at first. If the system is infected, it will not be repaired.

If it is clean of threats and still not booting, boot to System Recovery Options . Try Safe Mode with Command Prompt. In the command prompt .... enter the command ....

start msconfig

It will open the system configuration window, with the "general" tab selected.

• Click the "startup" tab. Click "Disable all" > Apply > OK.
• Click on "services" tab. Check the "Hide all Microsoft Services"; Click "Disable all" > Apply > OK

Then try to boot again normally. Is it failing still?

If so, boot to System Recovery Options once again. Try Enable Boot Logging. It will create a file named ntbtlog.txt. Collect it and upload it. If you cannot do it within windows, Boot with a live Linux disc and collect it in a USB stick, use the usb stick in another computer and upload it. It is necessary.

When you have a failed Update that prevents Win7 startup, the solution is to boot into System Recovery Options to System Restore to before the update was run. You must have missed that step.

If it fails and Startup Repair cannot find anything to repair after running it several times with reboots, then copy out your files and do the Clean Reinstall. Everything needed is in the same tutorial.

Essenbe: is a system repair disc different from a bootable USB made from a Windows 7 ISO or an Windows 7 install disc? I tried using both of those and neither would boot past the Windows logo.

xunuogui: Thanks for the advice, I'll try using Windows Boot Genius and see if it gets me any more data.

gregrocker: I can't boot into the System Recovery Options at all. When I try, it hangs before successfully booting into the SRO to do a system restore. Similarly, startup repair does not successfully boot either - it hangs and thus, I have not been able to running it at all. Hence, my thoughts about seeing if there's any other way to figure out what is wrong. I recognize, as I noted in my OP, that if I can't find any other options for repair, I will have to wipe the partition table and do a full re-install. I've already moved my files when I am successfully able to boot with a linux boot-USB.

I think more data collection would be preferable to try to find a solution but I'm at a loss as to how to collect additional data about what is causing the boot to fail or hang.

You'll need to boot the Win7 DVD or System Repair Disk as shown in Option Two of System Recovery Options.

How to Boot A Computer from CD or DVD - YouTube
You should be prompted to "Press any key to boot DVD" once it's set correctly in BIOS.

If it won't boot try vigorously tapping the one-time BIOS Boot Menu key,

If that fails reset the BIOS to defaults: Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS.

Gregrocker: I understand. I've tried booting from an install CD, as noted in Option 2. It will not load past the Windows logo. If it would be helpful, I can attach a camera-phone photo of it failing to load?

Where did you get the disk? Will it boot in another PC and load correctly? Try the latest official ISO written to flash stick or burned to DVD from Steps 1/2 of Clean Reinstall - Factory OEM Windows 7

Next reset the BIOS to defaults, try again: Clear CMOS - 3 Ways to Clear the CMOS - Reset BIOS

It is an official Windows 7 install disc from Microsoft. I used to it to install Windows 7 on my desktop and it loads properly when I boot from it on my desktop.

I've just reset my BIOS to the default settings. It being a laptop, it's a little harder for me to get at the CMOS battery or try to find the CMOS jumpers. Thus far, when I attempt to boot into "Startup Repair," it just sits at this screen, and the bar just continues to move from left to right.