Since using Excel 2007 in compatibility mode for older spreadsheets it has had a problem. Even in a new blank workbook it will stop for about five seconds every ten seconds or so. When this happens I cannot move to another cell or see any data I have typed, when it starts again anything typed will appear in a cell and the input box will move to the next cell if return or an arrow has been pressed. This makes using Excel a slow painful process, the systems admin people here at work don't know what the problem is. Can anyone help please?