I ran combofix, but I'm not sure it successfully completed? It didn't output the big log like it usually does. I've included what it did output. It did reboot, and I did get some errors about programs being marked for deletion. I did reboot (a couple of times).
My browser is still sometimes being hijacked (specifically to activitycatalogue.com, then someplace else). It's not consistent (it never has been), but it definitely happens.