Windows C:\ drive access denied and system tools not working on HP Envy 16

[elly3747]

I am having a serious Windows issue on my HP Envy 16 laptop.

When I try to open my C: drive, I get this error:

“C:\ is not accessible. Access is denied.”

I am also having problems with Windows system tools

Windows Security is not working correctly.

Device Encryption/BitLocker says “Something went wrong. Try again later.”

I cannot open Services (services.msc) because Windows says it cannot access it.I cannot run Command Prompt as administrator.

I already tried resetting Windows, but the problem is still happening.

I would like help diagnosing what is causing this and how to repair Windows.

[Hawks_Eye]

Hi @elly3747 

Welcome to the HP Support Community! We're here to help you get back up and running.

I understand the concern. Since the issue affects access to the C: drive, Windows Security, Device Encryption/BitLocker, Services, and even administrative tools after a Windows reset, this points more toward Windows permissions, system file corruption, or damage within the Windows installation itself rather than a typical HP hardware issue.

Please try the following recommended diagnostics and recovery steps:

1. Check HP Hardware Diagnostics First

Before focusing entirely on Windows, confirm the storage drive is healthy.

• Turn off the notebook.
• Power it on and immediately tap Esc repeatedly.
• Select F2 System Diagnostics.
• Run:
  • Storage Quick Test
  • Storage Extensive Test
  • Memory Test

If any test reports a Failure ID, note the result.

1. Start Windows in Safe Mode

If Windows permissions or a startup component is interfering:

• Hold Shift while selecting Restart.
• Go to:
  • Troubleshoot
  • Advanced Options
  • Startup Settings
  • Restart
• Press 4 for Safe Mode.

Once in Safe Mode, check whether:

• C: drive opens normally.
• Services.msc opens.
• Windows Security loads.

If everything works normally in Safe Mode, the issue is likely related to a Windows service, driver, or startup component.

1. Verify Drive Encryption Status

Since Device Encryption is reporting an error:

• Open Settings.
• Navigate to:
  • Privacy & Security
  • Device Encryption

If the page does not load properly or displays errors, make note of the exact message.

Also check whether there are any padlock icons on the C: drive in File Explorer.

1. Use Windows Recovery Environment

If administrative tools cannot launch:

• Go to Settings > System > Recovery.
• Select Advanced Startup.
• Restart now.

From the recovery environment:

• Select Troubleshoot.
• Select Advanced Options.
• Run Startup Repair.

Allow Startup Repair to complete and then check Windows again.

1. Perform an In-Place Windows Repair Installation

Since a standard reset did not resolve the issue, the next repair method is an in-place repair installation of Windows.

This process:

• Reinstalls Windows system files.
• Preserves personal files.
• Preserves installed applications.
• Rebuilds many damaged Windows components and permissions.

If Windows is still stable enough to boot normally, this is often more effective than a standard reset for issues involving Windows Security, Services, administrative access, and encryption components.

If the Issue Remains then the Windows installation itself may have extensive corruption.

In that situation, the most effective repair is:

• Back up personal data.
• Create Windows installation media.
• Perform a clean Windows installation.
• Install the latest HP drivers and BIOS updates afterward.

Before moving to a clean installation, could you confirm the result of the HP Storage Test and whether the reset you performed was a standard Windows reset or a complete clean installation of Windows? That detail will help identify the most appropriate next diagnostic step.

Take care, and have an amazing day!

Regards, 

Hawks_Eye