Problem: Outlook will only open in safe mode.
The problem is caused, in part, by the 'Windows Search' service. This service provides Outlook's Instant Search and Window's file search features. For a quick fix, you can stop or disable the Windows Search service.
To do this, open the Administration Tools folder in the Control panel and double click on Services. Look for Windows Search in the list. Double click it, then click Stop and Apply. You can also right-click on Windows Search and choose Stop. The next time you use Instant Search or Windows Search, the service will restart. To disable the service for a longer period, select Disable in the dropdown and click the Stop button, then Apply.
Please note: when you disable the search service, Windows File Search and Outlook's Instant Search won't work. Stop the Search service only so you can use Outlook in "normal" mode until you have time to repair it.
In Windows 7, you can type Services in the Start menu's search command or in all versions, type Services.msc in the Run command.