I am having the same problem. I am using VISTA and have been for over 6 months. No problems at all. Last night I heard a "whirring" sound coming from my HDD (I think) and now it won't reboot at all. I am getting a message that states that the file \windows\system32\winload.exe is missing of corrupt. Status: 0xc000000f...
"The selected entry (Windows Vista) could not be loaded because the application is missing or corrupt"
I have read the other forums and it appears as though 99% of the issues stem from having VISTA installed on a second partition or HDD and trying to boot from that. I have one HDD. It still won't boot.
Any thoughts?? Or do I do a complete install on a new HDD?