Download on PC extremely slow, but draws the most Internet?

Br
2

In my home, it is like that, when I download something on the PC, I just manage 1MB / s. In addition, then the WHOLE house has no internet, you can't even google something. But if, for example, I download something on my laptop, mobile phone or whatever, then it loads to 5 MB / s and you can look at the same time quite comfortably youtube.

Ri

Mbit / s (or Mb / s) and MB / s confused?

lo

Either an IP address conflict or malware on the pc. The latter also had my roommate my roommate.

More detailed information about the network configuration and the end devices would be helpful.