After startup, all icons and taskbar disappear...

Search your pc for google drive. Once located in your pc right click on the icon and scroll down to "pin to taskbar" click then done.
Hope this helps.

On all windows apart from Windows 8, you drag them from the desktop (left hand side) to the bottom (taskbar) with the mouse.

If the taskbar gets full up the icons might disappear.
The double bar at the end of the taskbar must be moved to the right for more of the taskbar to appear.

From what you are saying, it may be part of some app that is simple letting you know its working?

Try hitting ctrl and esc. You may have inadvertently hidden your task bar.

First, right click on the taskbar and select Properties from the right click menu.

Alternatively, you can go to the Control Panel and type the word 'taskbar' in the search box from the upper-right side. Once the search results are loaded, click on the link that says 'Customize icons on the taskbar'.

The Taskbar and Start Menu Properties window will show up on your screen. Here, go to the tab called Notification Area. In the System icons section check the Volume box and click on OK.

The Volume Mixer icon will now show up in the notification area of your taskbar

I hope that this information was helpful and thank you for contacting the experts.

Move the mouse to the bottom of the screen to make the taskbar reappear. If you want this to display at all times, right-click on any blank area of the taskbar and select Properties. Clear the checkbox next to Auto-hide the taskbar.

Right click on your taskbar then choose properties. On the bottom of the box opened, there is a check box with label "Hide Inactive Icons". Uncheck the box.

Open task bar properties, from control panel, choose taskbar and start menu. Uncheck the check box at the bottom of the window.

sounds more like either you have a virus, or there's someone who has hacked into your laptop to delete them.

if you haven't run a virus scan, i'd say do it now. if it doesn't turn up anything, then try a firewall and check for spyware as well.

start your machine in safe mode and if you have any antivirus installed in it and is updated then scan it , your laptop is infected with virus . so scan it