Windows 7 doesn't boot normally after latest Windows Update and System Restore

Windows 7 Home Premium , Asus N56VZ

There were no problems and no Trojans/viruses on the system before I installed the latest drivers offered by Windows Update last week (as far as I know). Before all this happened I made a manual Restore Point.

Backstory:
I got Nvidia and Realtek drivers + Intel driver for something. Damn me for not checking. If there was anything else, I can't tell right now and can't access Windows Update. On top of that I updated Avast antivirus to the latest version and uninstalled a few telemetry updates.

After the update finished I noticed severe slowdowns when working and yesterday, after installing another few KBs, Windows took around 30 minutes to boot and froze on desktop after (with mouse working). Not thinking much about it, I went to safe mode (works fine for a while, however hangs up after a random amount of time) and restored my backup from the last week.

Problem improved after restore, but did not disappear completely. Normal mode boots, mouse works, but then it freezes again. Uninstalling Nvidia drivers completely with utility solved the issue for safe mode. Could the backup/Win Update corrupt the drivers?

Current situation or TL;DR:
It's impossible to run or uninstall Avast in safe mode or in normal, it refuses to run and freezes the system on uninstall with their uninstall utility.

Normal boot with no Nvidia drivers takes normal times but it still has random freezes, where I can open the task manager and see that nothing is happening.

Driver check utility causes a BSOD blaming HIDCLASS.SYS
SFC /scannow reports an unrelated problem that I solved.
Hard drive is fine, no problems.
Event manager blamed audio drivers for long load.
Didn't get to memtest yet (laptop run perfectly before the updates)

So, should I try replacing all drivers on my laptop? Any other thoughts?
4 answers Last reply
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  1. When you say you restore from a backup, are you using a disk image or a Windows System Restore point?

    Reason I ask is that depending on what you're restoring from, it may not fully fix the issue.

    Best option at this point is to backup your data and re-install the OS. It's either that you have an infection or it's a Windows Update, but using Win 7 there's not too many updates left that could cause this much damage. It's more than likely an infection.

    Either way, back up your machine afterwards in case you have more issues. You should be using a disk imager (i.e. Macrium Reflect) or a snapshot tool (i.e. RollBack Rx)
  2. Thank you for your suggestions! I am going to run a disk imager as soon as I can.

    I used a System Restore Point.

    Malwarebytes could find no traces of any kind of infection. I also run both an Avast scan and a Malwarebytes scan just before the update. Zero issues.

    I suspect the damage was done by Win Update failing to install drivers properly and then the Restore using a corrupt version of those drivers, as after I managed to get old Nvidia, Realtek and Intel drivers (also repairing registry and system files again just in case), normal booted okay. I uninstalled Avast properly thru manually deleting the folder and letting it's uninstall utility run.

    Now, the only problem I have is my Sleep mode causing the machine to freeze (everything else seems to run fine). Is it because I'm using out of date Chipset and Nvidia drivers? Anything else that could be causing it? I reverted as suggested by Asus tech to drivers from their site, those are from year 2013.

    Should I attempt to flash new BIOS? I don't have the latest version of it, but I'm scared of doing damage to my laptop.

    Please advise. Thank you again for your help!
  3. Aristarh_1 said:
    Thank you for your suggestions! I am going to run a disk imager as soon as I can.

    I used a System Restore Point.

    Malwarebytes could find no traces of any kind of infection. I also run both an Avast scan and a Malwarebytes scan just before the update. Zero issues.

    I suspect the damage was done by Win Update failing to install drivers properly and then the Restore using a corrupt version of those drivers, as after I managed to get old Nvidia, Realtek and Intel drivers (also repairing registry and system files again just in case), normal booted okay. I uninstalled Avast properly thru manually deleting the folder and letting it's uninstall utility run.

    Now, the only problem I have is my Sleep mode causing the machine to freeze (everything else seems to run fine). Is it because I'm using out of date Chipset and Nvidia drivers? Anything else that could be causing it? I reverted as suggested by Asus tech to drivers from their site, those are from year 2013.

    Should I attempt to flash new BIOS? I don't have the latest version of it, but I'm scared of doing damage to my laptop.

    Please advise. Thank you again for your help!


    OK, if that is the case why don't you just uninstall the drivers?
  4. chkdsk couldn't find any problems, however, Seatools, native to this drive, found several errors, which it fixed. My hard drive is slowly failing, unfortunately this compounded with bad Win Update.

    I backed up all my data. Going to switch hard drive to a new one when it gets much worse.
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Intel Drivers Realtek Nvidia Asus Windows 7 Windows Update System Restore