Hi АЛЕКСЕЙ,

If you can't see any other drive other than C Drive on your PC, then you can try the below methods to resolve this issue:

Method 1: Try safe boot
Start your computer in safe mode and check if the issue appears there as well. If it does not appear in safe mode place the computer in clean boot state to identify the culprit program running in the background creating this error.
Safe mode is a diagnostic mode that starts your computer in a limited state. Only the basic files and drivers necessary to run Windows are started. The words Safe Mode appear in the corners of your monitor to identify which Windows mode you’re using.

1. First use your finger to make a sliding motion from bottom to top on the illuminated screen in Modern UI, then click once All Applications. If you are using a mouse, please right click once All Applications. 
2. Then on the command prompt character use your finger to slide from top to bottom, and click once more Executable by system administrator. If you are using a mouse, click on the command prompt character and right click, then click once more Executable by system administrator.
3. Click to input Bcdedit /set {bootmgr} displaybootmenu yes,when completed press the Enter key on the keyboard. If you need to cancel the prompt to enter options at startup, simply change Yes to No. 
4. Once completed, please restart your computer, then press F8 to enter setup screen upon startup, then press F4 to enter safemode.
5. If the problem does not exist in safe mode, try to perform a clean boot and check.

Method 2: Try Clean Boot environment
Putting your system in Clean Boot state helps in identifying if any third party applications or startup items are causing the issue. A clean boot is performed to start Windows by using a minimal set of drivers and startup programs.

You can follow the below mentioned steps to perform Clean Boot:

1. Log on to the computer by using an account that has administrator rights.
2. Click Start, type msconfig.exe in the Start Search box, and then press Enter to start the System Configuration utility.
   Note If you are prompted for an administrator password or for confirmation, you should type the password or provide confirmation.
3. On the General tab, click the Selective startup option, and then click to clear the Load startup items check box. (The Use Original Boot.ini check box is unavailable.)
4. On the Services tab, click to select the Hide all Microsoft services check box, and then click Disable all.
5. Click OK, and then click Restart.

After you have finished clean boot, follow these steps to boot to normal startup.

1. Press the ‘Windows + R’ key on the keyboard.
2. In the ‘Run’ windows type ’MSCONFIG’ and click ‘Ok’.
3. On the ‘General’ tab, click the ‘Normal Startup’ option, and then click ‘OK’.
4. When you are prompted to restart the computer, click ‘Restart’.

Method 3: Run SFC scan
If the issue persists in clean boot mode as well, I would suggest you to run Microsoft System File Checker tool to scan the system integration and fix any corruption.

1. Press "Windows+X" to bring up the menu below and then select "Command Prompt (Admin)" option.
2. Click "Yes" to run the command.
3. Type in sfc /scannow into the dialog and hit Enter key.
4. Wait until the System File Checker finishes the check.

I hope this helps in getting back the drives on your computer.

Regards,
Lokesh