where there should be like ''show desktop and window switcher has gone and been replaced with open progams (like word or firefox) how to get this back to normal please help
Right-Click your taskbar and highlight "Toolbars", then check "Quick Launch"
You will be good to go!!
Why the trouble. Press Windows Key and D together for show desktop.

Press Alt Tab for switcher. Press Control Tab for switch on click. Press Windows Key Tab for a kick *** windows switcher.

Anyways, the last answer is perfect for your question. Mine for your convenience.