I have never seen this before...

I was booting into Windows and discovered NTLDR.EXE was missing. So i booted into Linux, mounted the drive and discovered all the files were gone except a few folders. I do not recall deleting everything.

This may or may not be related, but a week or so ago, while working, got a blue screen (a memory dump, no clear indicator of where it went wrong), and upon cold boot the MBR was missing. Okay, I did a fixboot and everything was fine. Now it is this.

I am thinking:

1. A virus?

2. Trojan (I did find a "downloader.trojan" but I think it was for spyware and not a server/client type like Sub7, etc)?

3. The HDD is dying?

4. Somebody actually cared to delete everything?

Insights would be nice. Thanks.