There are two main reasons why you might be denied access to the C drive.
C drive not showing in File Explorer?
Wondering why and how to fix this annoying issue?

Now read this post to get solutions.
Way 1.
Open your setup, and press theWindows + Ikey combination to go to controls.
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ChooseUpdate & Security>Recovery.
Then clickRestart nowunder theAdvanced startupsection.
When you see theWinREwindow, selectTroubleshoot>Advanced options>Command Prompt.

In the Command Prompt window, typenotepad.exeand pressEnter.
Once the Notepad window appears, clickFile>Open.
Now you might locate the files you want to transfer.

Right-grab the files you want to transfer, and chooseSend to> grab the USB drive.
No progress bar will appear during the file copy process and the PC will appear to be frozen.
It is recommended that you do not shut down the computer until the data transfer is complete.

Way 2.
So, you’re free to try this way and find out if it applies to you.
Way 3.

Which file restore tool should you choose among a large number of secure data recovery software?
MiniTool Power Data Recovery is worth a try.
Now, download it and follow the guidance below to startsecure data recovery.
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MiniTool Power Data Recovery FreeClick to Download100%Clean & Safe
Step 1.
Launch MiniTool Power Data Recovery and you will see its main interface.
Stay at theLogical Drivessection, then move your mouse cursor to theC driveand click theScanbutton.

Once you click it, the software will start scanning the partition for your files.
The scan duration varies depending on the amount of data and disk status.
After scanning, there are usually three folders displayed:Deleted Files,Lost Files, andExisting Files.
Moreover, you’ve got the option to make use of theFilterandSearchfeatures to simplify the file discovery process.
More exciting still, you have the ability to preview the listed items for confirmation.
Note that only files not larger than 2 GB are supported to preview.
Previewing files is easy.
Just double-nudge the target item, or select it and click thePreviewbutton.
Step 3. check that you have selected all required files, and then click theSavebutton.
In the pop-up small window, browse and select a suitable location, and clickOK.
When the recovery process completes, you might click theView Recoveredbutton to view and use the recovered items.
Here is a tutorial.
it’s possible for you to implement the approaches mentioned below one by one until you resolve this problem.
Fix 1.
Assign Full Permission to the C Drive
In File Explorer, right-click theC driveand chooseProperties.
Under theSecuritytab, click theEditbutton.
Select your user name and see to it it has full control permission.
Return to the Security window and ensure that your user name has full control permissions.
Fix 2.
Here is how to do that.
Open theControl Panelby using the Windows search box.
Select theChange account typeoption.
Click your account, and then several new options will show up.
Click theChange the account typeoption.
In the new window, confirm theAdministratoroption is selected.
Fix 3.
To resolve this problem, you’re free to initiate the built-in error-checking tool from File Explorer.
First, open File Explorer by pressingWindows + E. Second, right-click theC driveand chooseProperties.
Move on to theToolstab, and hit theCheckbutton.
Occasionally, the error-checking process may get stuck or crash.
So, you’re able to give it a try.
Go tothis page, and click theDownload Nowbutton underCreate Windows 10 installation media.
Launch the downloaded Windows Media Creation tool and accept the license terms.
Such disk or system issues can often lead to system failures or the loss of data.
Consequently, its critical to regularly back up your system and data to safeguard against these potential problems.
Usually, assigning full control permissions or reinstalling Windows can solve it.