The "blue screne" that comes up is not the kiss of death blue screne although it is the same mono-chromatic color of blue with a full page of "checks" that the computer is going to do. My best guess based on it actually using the term somewhere in the process, is that it is scan disk if i recall correctly that was one of the tools that i used frequently in win 98. So as it goes through this process in numbered sections 1,2,3, and sometimes more, not sure how many but i'm think 4. It performs that task and the screne remains blue but you can see the progress in one way or another, either numbers rolling by or a progress bar. This has only happend to be 2 or 3 times since XP came out.
That was a BSOD. we need the text from that, if it appears again.
As far as the task bar- the entire thing is referred to as a task bar (merely for convenience purposes- we can't go around talking about the "start menu, quick launch, task, and clock"-bar-, contains the start button, Quick Launch area, the actual task bar , and the system notification area. Anything else besides those are extra toolbars, but aren't referred to as a toolbar, but rather by their name, such as the "address bar".
one possibility to try to restore your taskbar to it's former self would be to first unlock the taskbar, (by right-clicking an empty area of the taskbar and ensuring "Lock the taskbar" is unchecked), Then rightclick again, this time going to the "toolbars" option. Unselect all the options here except "Quick Launch".
Another method of switching applications would be to use the alt+tab key combination- this can make it easier to use the computer while we try to remedy your situation.