Touching the PC case = Shocking me --- HELP?

WertyRO

Honorable
Jan 18, 2014
30
0
10,530
So like 5 days ago I've ordered my new internet provider.
I got my router and I installed it, and of course, I had to remove the old one from the outlet and plug the new one.

Since then, when I touch my PC case when it is started, I electrocute myself easily. I can keep my hand there, but I feel small electricity vibrations.

I think that that also created a humming when using/recording my microphone. Like a ''FSSSS''.

What do I have to do next before electrocuting myself?