This happened on a couple of workstations in our office and I'm not too sure hwo to fix it, other than reformatting. Shortly after I installed Microsoft Office SP1a and SP3 (sp2 is included with sp3), programs will fail to start after a certain amount of time. Sometimes it happens after about an hour or so of the computer being turned on, and gradually starts to happen more and more frequently, such as about 5 minutes after the computer is initially turned on. All programs fail to start, even things such as the task manager will not start. You also cannot shut down. You can however still work programs perfectly fine that are allready opened. I've tried uninstalling the service packs and even Microsoft Office all together, but the problem persists. Does anyone know what's going on here, or possibly a fix? I've tried searching microsofts website but am unable to find anything useful.