If your Windows' Taskbar DOES NOT work properly, For example, your running programs' icon is missing or has a duplicated one. You can solve this problem by 2 methods listed below:
Method 1: (Work manually)
Press Ctrl + Alt + Delete \ Process Tab \ end all explorer.exe and iexplore.exe processes
Start \ Run \ type "regedit",click OK
Delete these three keys:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\explorer\StuckRects2
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\explorer\Streams
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\explorer\StreamsMRU
Back in Task Manager choose Shutdown menu - Reboot.
Method 2:
Download and run the VBS (VB Script) file here