A blank interface is caused usually by your browser and /or add-ons perhaps not being up to date. What operating system and service pack (if applicable) is this and what version of Internet Explorer is installed (whether or not you use it)?
Check this old FAQ regarding the blank interface: SecurityCenter fails to open, displays a blank white screen, or displays a JScript error
Or contact Technical Support, it's free by phone or online chat: Services and Support for Home and Office
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