Windows 8.1 having problems

Hi, all

I've downloaded, installed and uninstalled IP, and now have some problems with some icons. Icons without extension appear like this:

Just with a shield icon.

Also the same shield icon appears in *.doc files:

As I read in some solutions, I've tried: HKEY_CLASSES_ROOT\exefile\shellex and delete the subkey/folder 'IconHandler', but I have not that key..

However, I searched "IconHandler" and I have it here:

HKEY_CLASSES_ROOT\IE.AssocFile.URL\ShellEx\IconHandler

HKEY_CLASSES_ROOT\IE.AssocFile.WEBSITE\ShellEx\IconHandler

HKEY_CLASSES_ROOT\InternetShortcut\ShellEx\IconHandler

HKEY_CLASSES_ROOT\LibraryFolder\ShellEx\IconHandler

HKEY_CLASSES_ROOT\lnkfile\shellex\IconHandler

and many more..

I've read that some people fixed the problem by renaming IconHandler to IconHandlerX, but I don't know what to do.. it's really cumbersome.

Finally, I cannot change AIMP player icons (mp3, wma, flac, etc) They does not change or change to another wrong audio format (example: flac .files shows .wav icon)

And Windows Defender shows a blank icon.

Thanks

Regards