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Windows 7: Missing Unknown TPM Device

Summary: In the Other Devices section in Windows 7 Device Manager it may show an error as an Unknown Device, follow the steps in this article to resolve.

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Article Content


Symptoms


Unknown Device

In the Other Devices section in Windows 7 Device Manager it may show an error as an Unknown Device. Details on the device will show ACPI\MSFT0101 (Figure 1, English only).

Windows 7 Device Manager
SLN305713_en_US__1WIndows_7_Unknown_Device_ASM_01
Figure 1
 

This device corresponds to the TPM module which does not have a driver available for download on dell.com, but can be installed easily using Windows by following the steps outlined below.

Solution- steps to resolve the issue

  1. Right-click the Unknown device and click Properties.
  2. On the General tab, select Update Driver…
  3. Click Browse my computer for driver software (Figure 2, English only).

    Windows 7 Update Drivers
    SLN305713_en_US__2WIndows_7_Unknown_Device_ASM_02
    Figure 2
     
  4. Select Let me pick from a list of device drivers on my computer (Figure 3, English only).

    Windows 7 Browse for Drivers
    SLN305713_en_US__3WIndows_7_Unknown_Device_ASM_03
    Figure 3
     
  5. Select Security Devices and click Next (Figure 4, English only).

    Windows 7 Security Devices
    SLN305713_en_US__4WIndows_7_Unknown_Device_ASM_04
    Figure 4
     
  6. Select Trusted Platform Module 1.2 (or Trusted Platform Module 2.0) and click Next (Figure 5, English only).

    Windows 7 Trusted Platform Module 1.2
    SLN305713_en_US__5WIndows_7_Unknown_Device_ASM_05
    Figure 5
     
  7. Click Yes if you see a warning prompting you to confirm, then you should see a success message (Figure 6, English only).

    Windows 7 Updated Driver
    SLN305713_en_US__6WIndows_7_Unknown_Device_ASM_06
    Figure 6
     
  8. You should now be able to turn on BitLocker.

If you have further questions about this solution, please contact Dell Technical Support.


Article Properties


Last Published Date

10 Apr 2021

Version

3

Article Type

Solution