Help! Suddenly can't boot into Windows

All of a sudden I can't boot into Windows. After I select my Windows drive, it goes to a black screen with a flashing cursor for about 4 seconds, then reboots itself automatically. I can boot into it fine in VMWare, so most likely something screwed up the MBR or GPT or whatever Windows 7/Boot Camp uses. Any ideas on where to start with fixing this? Maybe use fdisk to repair the MBR?

Here's a report from Partition Inspector, if that helps:

*** Report for internal hard disk ***

Current GPT partition table:
# Start LBA End LBA Type
1 40 409639 EFI System (FAT)
2 409640 168181799 Mac OS X HFS+
3 168445952 234440703 Basic Data

Current MBR partition table:
# A Start LBA End LBA Type
1 1 409639 ee EFI Protective
2 409640 168181799 af Mac OS X HFS+
3 * 168445952 234440703 07 NTFS/HPFS

MBR contents:
Boot Code: Unknown, but bootable

Partition at LBA 40:
Boot Code: None (Non-system disk message)
File System: FAT32
Listed in GPT as partition 1, type EFI System (FAT)

Partition at LBA 409640:
Boot Code: None
File System: HFS Extended (HFS+)
Listed in GPT as partition 2, type Mac OS X HFS+
Listed in MBR as partition 2, type af Mac OS X HFS+

Partition at LBA 168445952:
Boot Code: Windows BOOTMGR (Vista)
File System: NTFS
Listed in GPT as partition 3, type Basic Data
Listed in MBR as partition 3, type 07 NTFS/HPFS, active

 

Quick update: if hit F1 right after selecting my Windows partition, I can get into the Windows boot options menu. Unfortunately, as soon as I press F8 to select advanced options, it goes to black and restarts.

 

Fixed. Swapped out my HDD for my DVDRW, loaded up startup repair from the Windows 7 disk, and did a bootrec /fixmbr and bootrec /fixboot. Problem solved.

I hate it that you can't boot from a USB device.