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Windows 7: Critical system driver is missing, or corrupt :(

11 Nov 2015   #1

Windows 7 Home Premium 64-bit
Critical system driver is missing, or corrupt :(

Hello sevenforums, I am greatly needing your assistance. Earlier today I uninstalled avast! antivirus as it was hogging up more RAM that I wanted. After restarting the PC to my dismay it would not boot up, going into a system repair which would then fail.

I looked at the details regarding the failed repair and it said \windows\system32\DRIVERS\ACPI.sys is corrupt

I went into the advanced options and it would not give me a restore point or restore image to use.

I googled for hours regarding this issue and tried several fixes using the command prompt including chkdsk, bootrec, and finally I found this which seemed to pertain to where I was at in regards to fixing this myself:

"If the Bootrec.exe tool cannot locate any missing Windows installations, you must remove the BCD store, and then you must re-create it. To do this, type the following commands in the order in which they are presented. Press ENTER after each command.

Bcdedit /export C:\BCD_Backup

ren c:\boot\bcd bcd.old

Bootrec /rebuildbcd"

-It did find a windows installation when previously it wasn't, I crossed my fingers and restarted and still nothing.

Now when it attempts to boot it does not go into a system repair, instead, it immediately says:
-File: \Windows\system32\DRIVERS\ACPI.sys
Info: Windows failed to load because a critical system driver is missing, or corrupt.

It no longer gives me the option to go into system recovery, so I can no longer get into the command prompt, it would never boot into safe mode either. I can get into my BIOS and it still detects my HDD. I bought this PC online a few years back as a custom build and it did not come with a Windows 7 disk.

Are all my saved files and games doomed? Willing to try just about everything because before deciding to uninstall avast! everything worked just fine like normal and I was enjoying playing Fallout 4... not anymore. Please, anyone out there know what to do?

My System SpecsSystem Spec
11 Nov 2015   #2

Windows 7 Enterprise x64

well according to MSDN, ACPI.sys is:
an inbox component of the Windows operating system. The responsibilities of Acpi.sys include support for power management and Plug and Play (PnP) device enumeration.

anyway, do you have a repair disk, if so, boot to that and try finding ACPI.sys on that and transfering it to your harddrive or try a system restore to before all this madness
My System SpecsSystem Spec
11 Nov 2015   #3

Windows 7 Home Premium 64-bit

As I said in my previous post, I do not have a repair disk, and when I was given the option for system restore it could not find any points.
My System SpecsSystem Spec


 Critical system driver is missing, or corrupt :(

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