We do understand the problem you are having, the problem is that you just
refuse to provide any details? We cannot see your computer, so we rely on
you to give details about what you see.
You say it only affects certain icons, which icons?
Default icons are associated with the file types.
A file type is designated by it's file extension, such as .GIF, .JPG, .EXE,
Each file type will have a different default icon.
Which file types are not displaying the proper icon?
Windows Desktop Experience