Why are there so many files that are all the exact same size at 1140KB. Are these advertisements or what. Downloaded one once and got nothing, but every search pulls tons of these. Newbie at this so thanks.

Hmmm...they could be ads or they could be infected. What type of file are they (mp3, avi, exe etc)? Stay away from them. There are some other well known file sizes that appear & some of those are infected.
WARNING: Viruses on the network you should be aware of

they are mov and showup as quicktime.

Have a look here
mov files