Sure they can run on linux but, its highly unlikely its on your machine
for these reasons: The run on linux IF the person is standing right
there at your machine installing it. For me to give you a web site and
you click on the URL and you go there and get infected with malware all
while being on ubuntu - so unlikely it is that you have a greater chance
of having a cold this instant just because I said that you do.

Yea, sounds silly - I know - but that is what we are talking about.

Yes. There are security problems for linux but I highly doubt this is
the problem - unless you believe someone has physical access to the
computer system.

Take a screen shot and post it to the photos section of the group so we
can see your Opera browser icons.