All of My Site Leads to Medication Site… help!

Hi all,

I am currently in charge of running a site that is set up in WordPress. All of my pages other than the homepage redirect to a Viagra medication site and I am not sure how to get this to stop. My hosting company said it was something I would have to do with WordPress. I did install the Pagelines theme a few months ago, but I don’t think it is because of that because a) they are a reputable company and b) I changed it back to the old theme and I am still getting this issue.

Anyone know how to fix this? Thank you!!

Meg