I am having pop-up boxes flash on my screen while using other programs. These are not pop-up ads they are like a command prompt box or update system boxes. They flash so fast i wasn't sure if I was seeing them or not at first. I have ran several virus scans including Norton Power eraser and didn't find anything.
Any suggestions as to what is causing this and how to stop it? It is very annoying. It has just started doing this over the weekend.