Alex: Bob, I'm getting a warning dialog box about windows update from time to time? I suspect my laptop is infected with virus. <br/><br/>Bob: It sounds like virus infection to me.<br/><br/>Alex: Could you [come over/come by] my cubicle for a minute to look at my laptop?<br/><br/>What's the difference between come over and come by?<br/><br/>Thanks in advance!