Somehow, I accidentally hit 'enter' key without reading thoroughly the message. Consequently, FilterKeys were kept turned on. This means keys were scrambled e.g. pressing CAPSLOCK = lower case, pressing alt+tab will tab from right to left, number keys are reversed too and so on.
In times like this, solution is right at the tip of the fingers. So, I did a quick search how to solve this and yup, I found the answer. I did the short and quick solution: "pressing 2 shift keys at the same time" and it did the magic.
If others experience the same, click and follow this GUIDE for more permanent remedy:
bbl







