As i don't have windows defender i had a little trawl through the microsoft newsgroups . It seems it's a known problem , or not depending who you are , but it seems you can also overcome it by tweaking the programmes registry settings.
A link for your perusal......
here. [img]/forums/images/graemlins/smile.gif[/img] [img]/forums/images/graemlins/smile.gif[/img]