Trouble with internal keyboard and touchpad

Hi,
Yesterday I just out of nowhere started having some trouble with my keyboard and touchpad on my MacBook Air.
The problem displayed itself on various ways. One thing was that I couldn't press regulary with the touchpad. When I was pressing one time, it acted like a pressed with two fingers. When I tried to type in my password on the administrator page, some of the keys didn't work at all and some started to act weird. For example when I was pressing the letter B, the "bar" which displayes where you are in the text (don't know the word in English) went backwards, and when I pressed the letter F it went forward. This seemes so weird and also gives me a hope that it might be some setting failure though B stands for backwards and F stands for forward.
I could log in to the guestpage where I tried to write in "notes". In notes, no letters at all was working, only numbers. When I tried to shut the computer down from the apple symbol I was asked to write administrator name and password. When I tried to mark the name to write it, there wasn't a "bar" but a cross, but on the other hand did it work to write in the password field. But of course not B and F..
Usualy I'd just press the on/off botton until the computer lockdown, unfortunately the botton doesn't work. So the only thing I could do was to let the battery die and hope that it would start when I recharged it and pressed start, this didn't go as well as I hoped, so now I'm stuck with a dead macbook air.
Any ideas of what could be the problem or/and any solutions what might do the trick?
Extremly greatful for any answers

Yes you need to use a wired keyboard.

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