Application icons missing from taskbar when minimized

This seems to work quite well. Always backup your registry anyways.

Kill explorer.exe and iexplorer.exe processes,

Then run regedit.exe

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