There are a couple things to check for this error:
1. Make sure internet explorer is not set to "Work Offline" > check under File menu by pressing the "ALT" button in IE to show the File menu.
2. Make sure that your Date / Time / Year are set correctly in Windows > double click on your clock in the bottom right
3. You may also want to empty your temp internet files from Internet Explorer > Tools / Internet Options / Delete button
I hope this helps.