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Thanks ChuckFickens, but IE has now taken over, using 100% resources even when nothing else is running. Makes opening apps very slow and impractical. Downloaded Adware, but it froze while scanning. I use Paretologic antispyware which picked up, and cleaned, a few low risks on Wednesday. Norton Corporate AV runs in realtime and Regcure runs at startup, although today it took about 20 minutes as opposed to about 4. It seems IE takes over after the popup has been closed. I've no idea what is happening here. Liz