Um, I found the errors, and there are too many to post. They are under Event Viewer, in the Application and System sections.
In Application, almost all are for Media Centre Guide, Media Centre Scheduler, Application Hang.
In System, almost all are for Service Control Manager. Here is a common one (error info after double-clicking):
The NTRU Hybrid TSS v1.05 TCSD service terminated unexpectedly. It has done this 1 time(s).
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp
Again, there are quite a lot of these, hundreds I think. Any help is appreciated. Is this tied in with the slower game performance?