A new dialogue box has started regularly appearing on my screen. The box is titled register and has a large section for text entry. You cannot enter text here. There are two buttons at the bottom right but only the cancel button can be used. The box then goes away but returns later. There is nothing strange listed in the 'alpplication' list if I try ctrl-alt-delt. I don't know what to look for in the 'processes' box. Any ideas?