Unable to start or inspect services
Unable to restore svchost.exe from installation cd - message returned by expand.exe: "Can't open input file: c:\winnt\system32\svchost.exe
No items visible in Add/Remove Programs list
Update - problem is solved. I finally discovered the correct syntax to expand svchost. Once I did that, the symptoms were gone.
I have run a couple of other malware detectors (a-squared and malwarebytes anti-malware), and found nothing more than tracking cookies (which I deleted). No suspicious activity according to Process Explorer. I believe this can be closed.