From a previous post:
<Quote>
I'm assuming that you're using a version of MS Office, and trying to
open a file which contains macros, in one of the Office programs. Since
macros can contain worms/viruses, the default Office Macro setting
probably has macros disabled. You can change that default setting by
opening the respective Office program for that file, click the Tools
menu, select: Security, and then choose the option that you want. The
above refers to Office 2000, settings for Office XP might be slightly
different. It is advised that you select the Medium setting, so that
you're always asked if you want to run macros. That way, if an email
attachment has a file used by that application, from an unsolicited
source, you can view the file, without running any potentially dangerous
macros.
</Quote>