Recent issue with Excel, in Windows 7 on an HP laptop purchased late 2011 (so it is compatible with and has appropriate resources to operate Windows 7. Excel, will somewhat randomly, indicate that the Control key is being help down, and function as if you are holding down the Control key (E.g. selecting different cells as you click on them). Annoying and the only apparent way to "cure" this is to re-boot. Any comments or advice? I have tried the Excel "self-repair" option, but this does not seem to help.