Create a brand new user and see if the problem re-occurs. If the new user does not have the problem, there is some corruption in the older user profiles.
Microsoft Advice:
In certain situations, you may not be able to browse sites if your Windows user profile is damaged. To troubleshoot, log on to the computer as another user and try to connect to a secure Web site. If you can connect to secure Web sites when you are logged in as a different user, this may indicate that your user profile is corrupted. In this situation, back up the information and settings that you want from your profile (for example, the My Documents and Favorites folders), and then delete the damaged profile. To delete a user profile:
Log on to the computer as Administrator or as a member of the Administrators group.
Click Start, and then click Control Panel.
Click Performance and Maintenance, and then click System.
Click the Advanced tab, and then under User Profiles, click Settings.
In the Profiles stored on this computer list, click the user profile that you want to delete, and then click Delete.
Click Yes when you are prompted to confirm the deletion.
Click OK, click OK, and then quit Control Panel.
Log off the computer as Administrator, and then log on as the user.
Windows creates a new profile for the user.
Note: Alternatively, you may want to create a new user, and then copy the data from your old profile to the profile of the new user. For additional information about how to do so, click the following article number to view the article in the Microsoft Knowledge Base: