If, while using your computer, you encounter the ACPI.sys Blue Screen error, read on as this post will guide you in fixing the problem. The ACPI.sys file is a Windows operating system file that is related to the MSDN 2939. ACPI.sys, the Windows ACPI driver, is an inbox component of the Windows operating system. It is the one that supports the power management as well as the Plug and Play or PnP device enumeration. And so if this file ends up getting corrupted, it is known to cause a Blue Screen error.
Another possible cause for the ACPI.sys Blue Screen error includes RAM issues, incompatible firmware, hard disk issues, corrupted drivers or malware infection, and so on. Here are some Blue Screen errors that can be triggered by the ACPI.sys file:
- KMODE EXCEPTION NOT HANDLED
- PAGE FAULT IN A NONPAGED AREA
- SYSTEM THREAD EXCEPTION NOT HANDLED
- IRQL NOT LESS OR EQUAL
- KERNEL DATA INPAGE
- SYSTEM SERVICE EXCEPTION
To fix the Blue Screen error associated with the ACPI.sys file, refer to the instructions provided below.
Option 1 – Try to recreate the ACPI.sys file
If the first option didn’t work, the next thing you can do is to recreate the ACPI.sys file. Every time your Windows 10 PC boots up, it looks for all the system drivers in place and if it is unable to find them, it tries to create them. This is why if you remove your corrupt driver file, chances are, you might get a fixed file recreated just for you. How? Refer to the steps below.
- Boot your Windows 10 PC in Safe Mode.
- Then open File Explorer and navigate to this location: C:/Windows/System32/drivers
- From there, look for the file named ACPI.sys and rename it to ACPI.old.
Note: As you can see, the file’s extension has changed from .sys to .old.
- Now restart your computer and check if the ACPI.sys Blue Screen error is now fixed.
Option 2 – Try to update or rollback the ACPI Driver
The first thing you can try to fix the Storport.sys Blue Screen error is to either update or roll back the device drivers. It is most likely that after you updated your Windows computer that your driver also needs a refresh. On the other hand, if you have just updated your device drivers then you need to roll back the drivers to their previous versions. Whichever applies to you, refer to the steps below.
- Tap the Win + X keys to open the Win X menu and from there, select the Device Manager.
- After opening the Device Manager, look for the ACPI.sys driver and right-click on it, and then select Properties.
- Next, go to the Driver section. Note that the rollback option would only be available if you’ve recently updated the ACPI.sys driver. So if you can’t see it then click on the Update Driver button.
- After that, Windows will automatically check for the problems that could be related to the Blue Screen error.
- Finally, restart your computer. It will just reinstall the device drivers automatically.
Note: You can also directly download the relevant drivers of your computer from the manufacturers’ website. So if you have an SSD, the issue might be due to an old storage driver. On the other hand, if updating the ACPI driver, didn’t work, you can also try to copy the ACPI.sys system driver file from the System32 folder of another computer that’s functioning properly and runs the same Windows OS version. Afterward, place it on your problematic computer and check if it fixes the BSOD error or not.
Option 3 – Run System File Checker or SFC scan
System File Checker or SFC is a built-in command utility that helps in restoring corrupted files as well as missing files. It replaces bad and corrupted system files with good system files. To run the SFC command, follow the steps given below.
- Tap Win + R to launch Run.
- Type in cmd in the field and tap Enter.
- After opening Command Prompt, type in sfc /scannow
The command will start a system scan which will take a few whiles before it finishes. Once it’s done, you could get the following results:
- Windows Resource Protection did not find any integrity violations.
- Windows Resource Protection found corrupt files and successfully repaired them.
- Windows Resource Protection found corrupt files but was unable to fix some of them.
Reboot your PC.
Option 4 – Run the Blue Screen Troubleshooter
Troubleshooting Blue Screen of Death errors wouldn’t be complete without the Blue Screen troubleshooter. As you know, it is a built-in tool in Windows 10 that helps users in fixing BSOD errors like ACPI.sys. It can be found on the Settings Troubleshooters page. To use it, refer to these steps:
- Tap the Win + I keys to open the Settings panel.
- Then go to Update & Security > Troubleshoot.
- From there, look for the option called “Blue Screen” on your right-hand side and then click the “Run the troubleshooter” button to run the Blue Screen Troubleshooter and then follow the next on-screen options. Note that you might have to boot your PC into Safe Mode.
Option 5 – Run System Restore
- Tap the Win + R keys to open the Run dialog box.
- After that, type in “sysdm.cpl” in the field and tap Enter.
- Next, go to the System Protection tab then click the System Restore button. This will open a new window where you have to select your preferred System Restore point.
- After that, follow the on-screen instructions to finish the process and then restart your computer and check if the problem is fixed or not.
The true cause is that there is no working Border Gateway Protocol (BGP) routes into Facebook's sites. BGP is the standardized exterior gateway protocol used to exchange routing and reachability information between the internet top-level autonomous systems (AS). Most people, indeed most network administrators, never need to deal with BGP.
Cloudflare VP Dane Knecht was the first to report the underlying BGP problem. This meant, as Kevin Beaumont, former Microsoft's Head of Security Operations Centre, tweeted,
"By not having BGP announcements for your DNS name servers, DNS falls apart = nobody can find you on the internet. Same with WhatsApp btw. Facebook has basically de-platformed themselves from their own platform."
Many people are very annoyed by this and with the fact that they cannot use their social media platforms but it seems that Facebook employees are in even bigger annoyance as it was reported that Facebook employees can't enter their buildings because their "smart" badges and doors were also disabled by this network failure. If true, Facebook's people literally can't enter the building to fix things.
Reddit user u/ramenporn, who claimed to be a Facebook employee working on bringing the social network back from the dead, reported, before he deleted his account and his messages:
"DNS for FB services has been affected and this is likely a symptom of the actual issue, and that's that BGP peering with Facebook peering routers has gone down, very likely due to a configuration change that went into effect shortly before the outages happened (started roughly 1540 UTC). There are people now trying to gain access to the peering routers to implement fixes, but the people with physical access is separate from the people with knowledge of how to actually authenticate to the systems and people who know what to actually do, so there is now a logistical challenge with getting all that knowledge unified. Part of this is also due to lower staffing in data centers due to pandemic measures."
Ramenporn also stated that it wasn't an attack, but a mistaken configuration change made via a web interface.
Both BGP and DNS are down, the "connection to the outside world is down, remote access to those tools don't exist anymore, so the emergency procedure is to gain physical access to the peering routers and do all the configuration locally."
Technicians on site don't know how to do that and senior network administrators aren't on site.
It seems that it will all be down for a couple of more hours before the issue is resolved. 
Parallels is an application developer for MAC OS mostly known for its PC virtualization software Parallels Desktop, a PC virtualization software running on Macs enabling running Windows and Linux with respective software on your MAC.
With its latest Desktop 17 version, the software can run natively on both Intel-based and M1-based MACs. Thanks to this feature MAC users will be able to benefit from various speed improvements while running both Windows 10 or Windows 11 preview.
On both Intel and M1 setups, Parallels resumes Windows and Linux up to 38% faster, provides an up to 25% bump in 2D graphics and a six-time increase in OpenGL graphics processing. M1-centric stats include 33% faster Windows start-up times, up to 28% faster DirectX 11 performance, and up to 20% better disk performance on Windows 10 Insider Preview.
Parallels Desktop 17 delivers a set of fresh features including a new video driver that enhances video and game playback and boosts Windows UI responsiveness. An improved Coherence mode lets users run Windows apps within the Mac environment, cutting down on distracting changes in appearance during Windows sign-in, shut down, and software updates.
Drag-and-drop operations are also improved, with support for text and graphics between Mac and Windows applications. This function works well with MAC OS Monterey's Quick Note feature, which can accept content from any Windows app.
USB support, disk management, copy and paste unformatted text, and automatic virtual machine optimization also receive upgrades. 
