Windows not booting

Whenever I try to boot windows, all I get is a black screen with a cursor (the command line kind, not an arrow). If i press something, nothing happens, and there is no disk activity. I primarily use Ubuntu as my OS, so I don't exactly when this happened. I have grub2 as my boot loader, but I know that is not a problem because I have restored the windows boot loader and it made no difference. I have run chkdsk /f on all of the partitions that windows installed, and it made no difference. BTW I have the same problem on my windows recovery partition.
If it helps, here is the os-prober entry in my grub.cfg (note: vista is what it calles my recovery partition):

Code:

## BEGIN /etc/grub.d/30_os-prober ###
menuentry "Windows Vista (loader) (on /dev/sda1)" {
    insmod ntfs
    set root='(hd0,1)'
    search --no-floppy --fs-uuid --set 645a82075a81d5e8
    chainloader +1
}
menuentry "Windows 7 (loader) (on /dev/sda2)" {
    insmod ntfs
    set root='(hd0,2)'
    search --no-floppy --fs-uuid --set 0aea5bf7ea5bde0f
    chainloader +1
}
### END /etc/grub.d/30_os-prober ###

zzz2496 said:

You should read GRUB's documentation. By the way, have you tried to boot the disk directly? Where do you put GRUB into?

zzz2496

I put grub on my hard drive, with my /boot/grub on my Ubuntu partition. I have tried to boot using Window's boot loader, and I got the exact same screen.

I will try chkdsk /r and post the results. Can't do it until tomorrow, though.

I tried chkdsk /r. I still can't boot, but now I have a feeling it is not Windows. I ran a system check on the recovery disk (like the installation disk, but without the installation), and it found no errors. It said my last successful boot was 4/18. I upgraded my Ubuntu around 4/22 to the 10.04 release candidate. I noticed the problem a few days ago. The problem may be related to the upgrade, but I have no idea how.

I have restored the Windows boot-loader, and it still won't boot. I don't think it is GRUB, but I don't know how it could be Windows.

Just found out some important information: when I get the blinking cursor screen, it is on the BIOS. I know this because I tried pressing ctrl+alt+del, and it restarted my computer, something that only my BIOS does.

I have the exact same problem with the same model. I got error messages twice about an incorrect command before this happened. Did you? Have you found a solution?