One of my Windows Server 2003 machines has suddenly stopped working. There have been no changes to its configuration or GPO. If I boot up the machine normally, it generally will get as far as "Applying Computer Settings." The machine will then freeze completely. The mouse and keyboard will cease to work, the machine will not respond to pings, and it'll just hang there on that same screen.
I've attempted to boot the machine in safe mode but it still doesn't work. In safe mode I can get as far as the login screen (with a few brief exceptions). Once I enter the login information, the machine freezes again. A couple of times it actually started the login process but then froze up.
Obviously I'm unable to access event logs, but according to a monitoring system I have set up on our network, this server first became unresponsive on Saturday evening. The only thing this server is running is Trend Micro Office Scan, which it's been running for a little over a year now. We have never had any issues like this with it before.