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How to Fix the "Unknown Device ACPIMSFT0101" Error in Windows 7 64-bit
Step 1: Download the Hotfix for Windows 7 64-bit
Visit the Microsoft Support website to download the hotfix for Windows 7 64-bit. Once the download is complete, unzip the hotfix into a temporary folder.
Step 2: Extract the Downloaded Hotfix
Open the temporary folder and extract the downloaded hotfix files. Do not make any changes to the files in the folder.
Step 3: Go to the Device Manager
Open the Device Manager by searching for it in the Start menu or Control Panel. Locate the "Unknown Device ACPIMSFT0101" and right-click on it.
Step 4: Update the Driver
Select "Update Driver Software" from the context menu. Click on the "Browse my computer for driver software" option.
Step 5: Select the Downloaded Hotfix Folder
Navigate to the temporary folder where you extracted the hotfix files and select the "Drivers" subfolder. Click "Next" to install the hotfix.
Conclusion
By following these steps, you will be able to fix the "Unknown Device ACPIMSFT0101" error in Windows 7 64-bit. This error is caused by a missing driver for a specific hardware component, and the hotfix provides the necessary update to resolve the issue. Remember to restart your computer after installing the hotfix for the changes to take effect. 
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