If you have recently upgraded to Internet Explorer 7 and cannot now get into the members area you will need to change the settings in Internet Explorer as follows:-
From the top line menu:-
[TOOLS]
[INTERNET OPTIONS]
[SECURITY]
[INTERNET ZONE]
[CUSTOM LEVEL]
Scroll down to near bottom of options
[SCRIPTING]
Set the Active Scripting marker to ENABLE
Set the Allow web sites to prompt for information using scripted window to ENABLE
Click [OK] to save then [OK] again to exit
Close Internet Explorer
Open Internet Explorer and try again, you should be able to use the members area.