Found the following Q & A on a Google search - take it for what it is worth -ther than that I have no idea!
Q: Every time I open a search engine or site I keep getting
a
message that says some file can harm your computer. If
the file information below looks suspicious or you do not
fully trust the source, do not open or save this file.
File name US
from sa.payment.aol.com
would you like to open the file or save it to your
computer. It has a check mark before a box that says
always ask before opening this type of file.
I have removed the check mark but it comes back up every
time I try to do anything. Can anyone help me? This
happened when I downloaded a file microsoft windows said
was a critical update. Thanks
A: Ive had a look at this and its very confusing, firstly,
dont download or accept this file, contact aol and ask
them what this is, it maybe nothing, but it maybe harmful,
check with aol. but DONT accept the file until you know,
and if it is from aol, ask them exacally what it is, then
you can decide weather to accept it or not.