Try this go to Start Run and type: outlook.exe /safe (yes there is a space
between exe and /) See if Outlook starts in safe mode and then close it and
try to restart it normally. If it does not start normally go back to the the
above method and once in Outlook go to Help and choose detect and repair.
You may or may not need the Office disk for the repair to complete.

"communitygirl" <communitygirl@discussions.microsoft.com> wrote in message
news:775D6C49-0058-476C-B1C1-27E9FDBF19BA@microsoft.com...[color=blue]
> Hello Everyone,
>
> All of a sudden, when I try to open Outlook 2007 running Vista Home
> Premium,
> nothing happens. There is no error message or anything. I'm able to open
> Word and Excel with no problem. I just can't open Outlook.
> Thanks in advance.[/color]