Fields Automatically Fill "////////////////////"

I have Vista and when I open any application with fields, even when I click "start" and in the search field, something starts filling in "////////////////////" and doesn't stop until the field limit is reached if it ever is. Sometimes, when I think I've been spared today, it doesn't start filling it in until I put the cursor in the field and other times still yet it doesn't start until I start typing in the
field. In all events, the computer is making a weird multiple short beeping sound probably for every "/" it enters. I'm up-to-date with my McAfee definitions and my computer is scanned nightly at 3am for virus. I'm up-to-date with my Microsoft updates including Vista Service Pack 2.