LOST START MENU AND TASKBAR WIN7 32bit

Now this is really weird, this morning my gf had to move the monitor to one side of the desk to clean, by some odd reason all the desk top icons along with the clock and some other gadgets dissapeared and the Start button / bottom Task bar appeared!!, so, first thing i did was check the plugs/adapter leads things that are held in place by screw things, by tightening them, then disaster, the icons reapeared but Task-bar and Start no longer show, i removed all the conections on the back to check in case a pin may of got bent but all look fine, maybe now somone might know whats going on?, so think that this is not a Malware problem, as the PC boots up and goes online in 30 seconds and everything seems

Jacee said:

It sounds like you have malware on your machine .... don't bother updating, you need to get rid of the infection.

maybe but please read my updated reply today Jacee.

SOLVED,
After trying many suggestions my GF moved the monitor over to one side of the desk to clean behind it when weirdly both Task-bar / Start button re-appeared but! all the other icons and gadgets vasnished!, my first thought was a cable had come adrift, tried tightening the cable sockets and everything reverted back to missing Start and Task-bar missing but the icons and gadgets were back, so i thought well if the Start/Task-bar work i must still have them somewhere as i just see them, cutting this short as i tried everything i could try ended up at "screen resolution" clicked "multiple layers" and clicked "show desk-top on 2" Task-bar and Start button appeared, how i nearly ended up reformatting and a big bill, i had tried this i am certain but it did not work before, something must of reset itself maybe?, anyway happy its back, thankyou to all for your time and help, great Windows help/info site!,