Hi 
Rex, it sounds like a "Phishing" exercise! Anything that claims there
is a problem of any type with your computer and then asks you to
download their program to fix it is likely to be an attempt to trick
you into installing some malware/virus onto your machine.
It does sound like either your machine is already infected or that
somehow you got to a wrong website/web-page that is trying to mimic
our download page. As Tim recommended, it is a good idea to get an
antivirus program or anti-malware suite or entire Security Suite and
then scan your machine with that. I use AVG but i've never tried the
one Tim recommends so i don't know which is best. I just use AVG on
all machines (except the non-Windows ones where i sometimes use
ClamAv) and have done quite happily for years. In some surveys it's
listed as the best of the free ones.
In the meantime it might be a good idea to use our official download
web-page, unless it's the one you just tried. Did you use either this
one?
http://www.libreoffice.org/download/libreoffice-still/
or this one?
http://www.libreoffice.org/download/libreoffice-fresh/
Either of those should be safe. We usually develop 2 branches at the
same time. Fresh tends to have newer features and better
compatibility with MS Formats but may have a few unexpected things
broken (although most people generally don't dig around enough to find
them). Still tends to be more solid and reliable but lacks the newer
features and may not have such good compatibility with MS Formats.
I think most of us on this mailing list tend to use "Still" for most
of our clients machines and on ones we don't have easy access to or
don't want to have to keep trying to fix but then try use "Fresh" on
our own machine or on a test machine.
Regards from
Tom 