I am running MS Office 2010 in Windows XP SP3.
From day to night, if I open a new Word file and try to save it, I received a prompt sound from Windows without any message, and the file is not saved. The same happens if I try to use "save as".
If I open and existing Word file, the command "save" works fine, but the command "save as", receive the same prompt sound from Windows without any message.
For Excel and PowerPoint everything is fine.