A sharp-eyed reader noticed an odd editor's note at the bottom of an INDenver Times account about the CU Buffs' 24-0 victory over the Wyoming Cowboys this past weekend. It reads: "Comments have been turned off on football stories involving CU to meet the university's requirement for giving media credentials to Web site reporters and photographers."
Turns out this line means precisely what it says. According to Dave Plati, CU's director of sports information, the university will not provide press passes to websites lacking a print or broadcast component unless they disallow pseudonymous posts or anonymous comments -- an absolutely standard function in the Internet age.
It's not an OS limitation as far as I can tell, I have the buttons you're missing on my installs of Windows 7. They are all Windows 7 Ultimate version and I'm logged in as a Domain Admin on my home network.