I recently installed Windows 7 home premium upgrade on my laptop. For the first week or so everything seemed to work ok. Then about a week ago the screen began to change to user logon after setting idle for 15 or 20 minutes. I checked my personalization settings and it shows the user logon on resume checked. I tried to uncheck it, but it will not let me change it. Any suggestions on how to resolve this problem? Thank you in advance.