Modem help

Question

I live in tulsa oklahoma and i recently order cox high speed internet. after a few days it started to slow down so i scanned my computer and i removed my spyware and other viruses then did a system restore to a few days ahead when i got on my computer the spyware was removed but my internet speed was down to dial up speed idk if i changed some settings the technician made or what but dial up speed is really annoying can anyone help me plz??