Hi Monica and wlecome to the forum!
Sounds to me like you are infected with something.
For starters, download install, update and run both MalwareBytes AntiMalware
. Get the free versions and do the complete scans with both. This could take a while so go kill some time while they are scanning.
Remove all elements found and reboot if prompted to do so.
If this does not clear up your issue let us know so that we can get you moved to the Malware Response Team.