IE8 on Windows 7 RC fails to Open

We’ve been running Windows 7 on several systems recently.  It’s a great OS and a well needed upgrade.  We’ve experienced a recurring issue however.  After a while IE8 would simply stop opening – You’d click the icon and it’d try a bit but fail.  Eventually we discovered you could right click and open as administrator – This would work but exposed the system to additional security issues and took extra work.  When I realized this it occured to me that perhaps some sort of addon was failing without administrative rights – I launched IE8 as admin – Went into internet options advanced tab and performed a full reset.  Once complete I was once again able to launch IE8 as a normal user.  I hadn’t installed much for plugins so it would seem that it’s either the skype addon, google gears, java, or flash.