Error message when trying to accept outlook calendar appointment

Microsoft Windows XP

When I try to accept a internet appointment and post it to Outlook Calenda
(2000) I get the folllowing error message: can't open: c\documents and
settings\username\local settings\temporary internet files. This is a recent
Outlook 2000? Really?

What operating system are you running this on?
What Internet Explorer version?

When was the last time you cleaned out your Internet Explorer Temporary
Internet Files?