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The Windows Driver Policy

Guevara, Rodrigo (NLC) 0 Reputation points
2026-05-21T01:29:49.8466667+00:00

I'm trying to use my TI-84 Plus CE Python graphic calculator but it keeps getting blocked and I'm not allowed to use it any more when I connect it to the computer using the correct software. I've tried finding different solutions to remedy this but with no luck at all.

I really need this fixed so that I can keep using my calculator for my college assignments.

Microsoft Security | Microsoft Defender | Other
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  1. AI answer

    2026-05-21T01:30:01.71+00:00

    The calculator is most likely being blocked by Windows security because its driver is considered incompatible or vulnerable. Windows uses features like Memory Integrity (Core isolation) and the Windows Driver Protection database to prevent certain drivers from loading.

    Use these steps to try to restore functionality:

    1. Check for an updated driver
      • Make sure the latest TI‑84 Plus CE driver and software are installed.
      • In addition, install all available Windows updates so that Windows can pick up any newer, compatible drivers:
        • On Windows 11: Select Start > type Settings > Windows Update > Check for updates > install any updates.
        • On Windows 10: Select Start > Settings > Update & security > Windows Update > Check online for updates from Microsoft Update and let updates install.
    2. Check Device Manager error code
      • Right‑click Start > Device Manager.
      • Find the calculator under Portable Devices, Universal Serial Bus controllers, or similar.
      • Open Properties and check the Device status box.
      • If it shows Code 48 ("The software for this device has been blocked from starting because it is known to have problems with Windows"), the recommended resolution is to obtain a new driver from the hardware vendor and install it. If TI does not provide an updated driver, the device will continue to be blocked when Memory Integrity and related protections are enforced.
    3. If Memory Integrity is blocking the driver If a notification appears like “A driver can’t load on this device” mentioning the calculator’s driver, Windows Security’s Memory Integrity is preventing it from loading. First try the updated driver steps above. If no compatible driver is available and use of the calculator is critical, Memory Integrity can be turned off (this reduces protection and may remove Secured‑core status on supported PCs):
      • Open the Core isolation page directly via Core isolation, or:
        • On Windows 11: Start > Settings > Privacy & security > Windows Security > Device Security > under Core isolation, select Core isolation details.
        • On Windows 10: Start > Settings > Update & Security > Windows Security > Device Security > under Core isolation, select Core isolation details.
      • Set Memory Integrity to Off.
      • Restart the PC and reconnect the calculator.
      Note: Turning off Memory Integrity lowers protection against certain attacks and, on Secured‑core PCs, takes the device out of Secured‑core state.
    4. If the driver is blocked by Windows Driver Protection (Code 48)
      • When Device Manager shows Code 48, Windows has determined that this driver is known to cause problems and has blocked it.
      • The only supported resolution is to obtain an updated driver from the calculator’s manufacturer and install it. If the manufacturer does not provide a fixed driver, the device will remain blocked under current Windows driver policies.

    If updated drivers from TI resolve the issue, Memory Integrity can remain on. If no updated driver exists, the choice is between keeping protections enabled (and the calculator blocked) or disabling Memory Integrity with the security trade‑offs described above.

    References:

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  2. L S 0 Reputation points
    2026-06-11T18:36:22.3133333+00:00

    The uninstall/reinstall will work for a while, but then the blocking will be triggered again at some point. Microsoft explains that in detail. Memory integrity was not the issue at all, as it was already switched off when this happened.

    This is what I did. It works temporarily, until the next restart. Unfortunately, it is not feasible to get ALL of my students to do this too, each time they need to use it.

    You'll need your Bitlocker recovery key for this process, so get that first. To find it, sign in to your Microsoft account, then:

    Devices --> info and support (under the computer you want) -->Manage recovery keys (under Bitlocker data protection).

    The recovery key is what you need - it's a 48 digit number.

    Then in Windows 11,

    Settings --> System --> Recovery --> Advanced Startup --> Restart

    After restart:

    Troubleshoot --> Advanced Options --> Startup Settings --> Restart

    At this point, enter your Bitlocker recovery key, which you retrieved above.

    The computer restarts. Choose 7 to 'Disable driver signature enforcement'. Be aware this is disabling the whole thing, not just allowing this one driver.

    Open TI-Connect or TI-Connect CE. Plug in your calculator, and it should work now.

    Again, it will be blocked again once the computer restarts. If you need it often, don't restart or shut down, only 'sleep' it.

    I think it's unacceptable that Microsoft suddenly did this, and didn't even provide an option to allow a single driver, say, after a warning that it's unsigned.

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  3. Guevara, Rodrigo (NLC) 0 Reputation points
    2026-05-21T01:36:33.77+00:00

    Well I've tried all that and still remains the same

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