Not being able to open task (InfoPath) after upgrading to Blackpearl

In my VM (single machine instance) I updated from Blackpoint 4.5 to Blackpearl 4.5. Everything appears to have worked just fine except when I try to open a task.

When I try to do that, instead of InfoPath opening, the XML opens in Visual Studio.

I have no idea where else to look to try to fix this problem. Any ideas what to look for will be great.

Thanks.

Oscar