1. Check your firewall settings as this can cause some parts of sites not to open.
2. Also in firewalls (e.g. Norton) there are options for turning off/on ad blocking as this can sometimes cause certain windows that it sees as adware not to open, even if it is not adware.
3. Also try turning off your pop up stoppers in your browser if installed as it can cause similar effects.
4. Lastly check your security settings for active X and java, and see if they are set to 'disable', and if they are and none of the above has worked, change them to 'prompt' first of all to see if that makes a change. You will find them in the 'security' settings in Internet Properties under Custom Level. Ensure that you only authorise the safe active X controls and plug ins, not the unsafe ones.