I have this weird problem. I can not open Excel and Powerpoint at the same time. I have to quit PP in order to open Excel or it won't open. Also Excel needs to be off or PP will crash when opened. Word seems to be working fine. I have reinstalled Office 2008 now twice with no help. I have also updated to the lates 12.1.5 version and no help. I also tried to repair permissions and deleted the .plist files but that did nothing. Any ideas?