The problem is that all files and folders cannot be displayed, and hidden files and folders cannot be displayed.

All files and folders cannot be displayed, and hidden files and folders cannot be displayed.

Today, my computer at the company is poisoned. As usual, set the folder option to display all files and files. But today, I am not obedient. I chose "show all files and folders" as the folder option. However, after I press OK, I still cannot hide the file. I will go back to the folder option to see it, restore to "do not show hidden files and folders". Dizzy, fight with me ~~~

Later, I looked for information and finally found out what happened. It turned out that the Registry was maliciously modified by viruses. Here are the solutions:

Find the HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced \ Folder \ Hidden \ showall branch, and double-click the checkedvalue in the window on the right. The key value should be 1. if the value is not 1, change it to 1.

If your settings still do not work, let's take a look.
Some Trojans set their own properties as hidden and system properties, delete the "Hide protected operating system files in Folder Options" and the "show all files and folders" option in the registry, so that procexp can be seen in the process, however, the source file cannot be found in the directory where the file is located and cannot be deleted.
In this case, you can store the following content as the showall. reg file, and double-click the file to import it to the Registry.

Windows Registry Editor Version 5.00

[ HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced \ Folder \ Hidden \ nohidden ]
Regpath " = " Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced "
" Text " = " @ Shell32.dll , - 30501 "
" Type " = " Radio "
" Checkedvalue " = DWORD: 00000002
" Valuename " = " Hidden "
" Defaultvalue " = DWORD: 00000002
" Hkeyroot " = DWORD: 80000001
" Helpid " = " Shell. HLP # 51104 "

[HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced \ Folder \ Hidden \ showall]
" Regpath " = " Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced "
" Text " = " @ Shell32.dll , - 30500 "
" Type " = " Radio "
" Checkedvalue " = DWORD: 00000001
" Valuename " = " Hidden "
" Defaultvalue " = DWORD: 00000002
" Hkeyroot " = DWORD: 80000001
" Helpid " = " Shell. HLP # 51105 "

[HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced \ Folder \ superhidden]
" Type " = " Checkbox "
" Text " = " @ Shell32.dll , - 30508 "
" Warningifnotdefault " = " @ Shell32.dll , - 28964 "
" Hkeyroot " = DWORD: 80000001
" Regpath " = " Software \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced "
" Valuename " = " Showsuperhidden "
" Checkedvalue " = DWORD: 00000000
" Uncheckedvalue " = DWORD: 00000001
" Defaultvalue " = DWORD: 00000000
" Helpid " = " Shell. HLP # 51103 "

[HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced \ Folder \ superhidden \ Policy]

[HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ Explorer \ Advanced \ Folder \ superhidden \ Policy \ dontshowsuperhidden]
@ = ""

Procedure:
1) create a file in Notepad
02) copy the above content to the new notepad file.
03) save it as show. Reg from the notepad file menu.
4) double-click the stored showall. reg file and click the button in the pop-up dialog box.

Note: The above method is effective for Win2000 and XP