If you have installed Excel 2003/2007 and Adobe Professional 7, 8 or 9, you may get the following error when you start Excel 2003 or Excel 2007:
"Compile Error in Hidden Module: Distmon" 
Cause:
The cause of this error is PDFMaker.xla, which loads at startup.
In Office 2007, we have the possibility to personalize our Quick Access Toolbar (extension: qat). Every modification, that differs from the default Quick Access Toolbar, will be saved in the following directory C:\Documents and Settings\%username%\Local Settings\Application Data\Microsoft\Office (where %username% must be replaced by your current login name)