I am having problems with blocking off text. My OS Windows XP (Pro). When I try to block-off a sentence, paragraph or more, my cursor rarely starts the operation at where I want it to start. It starts in mid-sentence or paragraphy, and sometimes even skips about and selects a single word. Is this a software or hardware problem? I've not done anything of late to cause this, as far as I can tell, and I do have an anti-virus programme running. I've gone to Control Panel, Mouse, and tried various things, but I cannot seem to correct the matter. Any help will be appreciated. M. W. Poirier