I am having a problem with adware on my computer. I downloaded MalwareBytes and AdAware but they don't seem to have gotten everything. The problem I am having is at random times an ad will sound on my computer. A voice will come on and say "Congratulations, you won." Everyone knows that annoying ad. No internet browsers are open when this happens. All it is, is just a sound. But after a while a random ad from the internet will pop up in Internet Explorer even though Firefox is my default browser. These ads vary and show no connection with each other. I opened up Task Manager one day to get rid of a nonresponsive internet explorer ad that had popped up, and noticed there are quite a few in there. Even though one window will be open, it shows about six or seven in the processes tab. Trying to end the process will only take care of a few as they will keep opening up in the processes tab. I did find a file however that I believe is linked to this. It is "pt54rX78.exe. I closed it, and all of the internet explorer processes went away. I did a search on the computer to find it and delete it. I found it, deleted it, however it keeps coming back somehow and keeps turning itself back on. Any help would be very appreciated.