Excel Ribbon won't work
 

I have Office 2007 and recently upgraded to Windows 7. I have a minor
problem. Sometimes when I open an Excel document (about 50% of the time) the
ribbon will not work. I have found that if I maximize or minimize the screen
that the ribbon will then work. So this is not an urgent major problem, but
it is not right. I have been working with MS Tech support and they have not
been able to get it fixed. Any ideas?
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Thank you