Problem opening documents from Sharepoint

Symptom

When trying to open a document from Sharepoint the browser freezes.

Possible cause

Upgrading from Office 2003 to 2007.

Solution

1. In Windows Explorer, navigate to C:\Program Files\Microsoft Office\Office12
2. Delete owssup.dll
3. Run the Office diagnostics by selecting Start > All Programs > Microsoft Office Diagnostics. This tool will find the missing component and install the "correct" version.

I actually couldn't follow step 3 since I didn't have Office diagnostics installed. I used Repair from the installation wizard instead and that worked like a charm.