je sais pas comment tu désinstalle, peut-être qu'il reste des traces de quelque chose :
Manual installation / SkyUI 2.2 or older
View the contents of the SkyUI archive you are using, look for each file at its install location and remove it.
If this fails, consider removing your interface folder and use Steam to revert it to its original state (see Troubleshooting).
Manual installation / SkyUI 3.0 or newer
Locate the Data/ folder in your Skyrim installation directory. Typically it's found at Program Files/Steam/steamapps/common/skyrim/Data/.
Delete SkyUI.esp and SkyUI.bsa from the data folder.
Donc en gros si tu as utilisé une vieille version, surtout avant la 3.0, il y a peut-être encore des choses installées.