About the Refund Scam category

Scammers are contacting victims of scams in order to “refund” them the lost money, but they end up stealing more money by fooling victims into thinking they’ve received more money in their bank accounts, only to send the scammer money they never received.

I consider myself somewhat bright. But, i ha e Norton, so i thought it was real…i feel like someone is robbing me.
They keep coming into my computer, so i have to unplug from the web.
The blue sxreen comes up…Working on your computir"
I uninstalled everything, but they have buried something somewhere. WHAT DO I DO?