OK, let me be really specific...

I have long suspected that some program takes over my system and them emulated
or rather installs another system on top of it so that it can use my original
system to hijack my wifi connection and files share, snoop or something worse.

One reason for this is that when I do get the Wifi to work there is briefly a
flash of Firefox on my screen that vanishes again and never shows up to me
anywhere, and Firefox doesn't open until I click again to open another Firefox,
THEN I get something like 0-75 Bytes per second access.

I was thinking that maybe my having used only one user and one password for
Admin and for my use of the system had allowed them to sniff, snoop and subvert
my system. Is this possible? Probable?

I read somewhere, where the CIA bragged that Unix was totally coopted from the
beginning.