I'm not sure if I'm infected or not. We have a computer running Windows XP, service pack 3. There were two log-ins on the machine - both were admin accounts. I few days ago I decided that was probably not a good thing, so I created a new admin account and made the existing accounts limited users.
On the 1st user account, when I tried to access yahoo web mail, it kept redirecting to a google search results page returning a search on the term "http." Yahoo mail worked on the the second user account, and on the admin.
Quickbooks however did not work on any account. Last night, I reset the second user account back to admin so I could access Quickbooks and bill. I left it on the admin setting overnight. This morning I woke up and I can't get to yahoo mail on any of the accounts. The server connection times out. I called yahoo business mail and they've tested on their end and say there is no issue.
A Norton scan and a Malwarebytes scan both found nothing.
I'm able to access all other webpages with no problem. Is this an infection or something else?