Excel 2007

I’m now running Office 2007, Professional, SP1 on Windows Vista Businnes edition. My hardware is Sony Vaio, Intel 2 Duo, 4 Gb of RAM. When working with Excel something strange happens. All kind of Graphics that I insert ont he sheet it got frozen, and doesn`t react with mouse. I can’t resize, drag, or editdirectly on the graphic.Something like this happens with me in Windows XP, SP3, and the solution from Microsoft Technical Assistence, in a sequence of unsuccessefull try & error tentatives, they have recomended a fully uninstal and reinstall of Office.Anybody knows another way to corret this?