Several users have reported an issue whereby the driver for the Skalarki hardware can no longer be loaded because it does not comply with the Windows driver policy.

The error message cited is as follows:

This driver has been blocked
mchpusb64.sys does not comply with the Windows driver policy.

by Author

The message appears following a Windows Update. The hardware can then no longer be used.​

We don't have this problem on our own machines (yet), but from the user feedback we can confirm that this is a general issue, especially when installing or reinstalling the profiler. The only way to disable this issue is currently to disable driver signature enforcement. Here is how to do it:

Method 1 (one-time disable)

This method disables signature enforcement for the current boot session only — the safest approach.

Step 1 — Open Advanced Startup
Go to Settings → System → Recovery and click Restart now under "Advanced startup."

Step 2 — Navigate the boot menu
Click Troubleshoot → Advanced options → Startup Settings → Restart.

Step 3 — Select the option
After the restart, press F7 to select "Disable driver signature enforcement."

Windows will boot normally with enforcement disabled for this session only.

Method 2 (permanent disable)

Step 1 — Open Command Prompt as Administrator

Press Win + S, type cmd, right-click Command Prompt, and select Run as administrator.

Step 2 — Run these two commands

bcdedit /set loadoptions DISABLE_INTEGRITY_CHECKS bcdedit /set testsigning on

Step 3 — Restart your PC
After rebooting, you'll see a "Test Mode" watermark in the bottom-right corner of the desktop — this confirms the setting is active.

To re-enable (undo) later, run:

bcdedit /set loadoptions ENABLE_INTEGRITY_CHECKS bcdedit /set testsigning off

​The only permanent solution to this problem is a new driver. This is currently being developed. We'll keep you updated.