Configuring a new laptop comes with a lot of work. You have to install all the software you are used to, apply all the updates, change the configuration and so on. So after installing Visual Studio 2008, I continued with the SP1 upgrade. But after the installation was done, I got the following error when I tried to open a work item in Team Explorer:
Could not load type 'Microsoft.TeamFoundation.WorkItemTracking.Client.WorkItemTypeDeniedOrNotExistException' from assembly 'Microsoft.TeamFoundation.WorkItemTracking.Client, Version=9.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'.
As the TFS administrator inside my organization, I had seen this error mentioned before, so I knew how to solve it.
Running the VS2008 SP1 install for a second time will patch Team Explorer up to the required level.