Update: Microsoft has released another update for Office 2004 (version 11.6.2) which corrects this problem.
On Tuesday, Microsoft released updates for both Microsoft Office 2004 and 2008 to correct some security vulnerabilities in the software, but a number of people are having difficulties opening some Excel spreadsheets in Office 2004 after the update.
As mentioned by CNET member and MacFixIt reader Kurt in the comments of our article announcing the update:
"After applying the update yesterday, some Excel documents refuse to open. For a fraction of a second the open progress bar shows up, then nothing happens.&… Read more