very strange problem with my taskbar icons

Hi all (I'm italian, excuse me for my bad english). I have a pc with windows 7 home premium 64 bit. I have a problem with some icons on taskbar: sometimes some applications are displaying the wrong icons, sometimes, as you can see (screenshot), I don't see some icons: sometimes a few are missing...

Something weird has happened to my taskbar. I have a few programs pinned there and everything was okay. Then today I unpinned Firefox from there because I wanted to change the icon I was using. After deciding I didn't like it I tried to go back to the one I was using but when I pinned it back to...

Hi all :D I noticed on my laptop if i add more then 4 icons to notification area (show icons and notifications), when adding the 5th icon ->the "show hidden icons" icon (the small up arrow like in the photo ) disappear ! . when i remove the 5th icon from notification area, then the "show...

Lately, a lot of my program icons and file type icons seem to have been replaced by the Windows default file or application icon, as shown in this screenshot. I haven't had any luck so far finding a solution to the problem. Virus scanners have yielded nothing useful either.

Each time I have booted in today, the Taskbar icons look like this. They seem to be instances of Notepad and WLM that were open during the previous session, closed before shutdown , then reappear like this on reboot. WLM and FF icons that were pinned to Taskbar are gone and need to be...