My fiancé has little skill with computers was fooled by an advertisement claiming that our computer was 'at risk'. I am not unable to close the web alert pop up. This is making me very anxious. I have already ran a full system scan and have had no conclusive results. What do I do? And how to I close the pop up? Thakn you in advance.
You could also try using System Restore to go back to before this happened and that can be done in regular or safe modes.
If successful temporarily turn off system restore to delete the 'infected' restore point. It's mentioned in that link that Peacekeeper posted.