Linux works fine, but when I try to boot windows with GRUB, the screen just goes black (The computers still on), and I have to restart and use linux. I use linux more often than windows, but I still have to do some things on it.

Thanks for any help.

Please provide some details about your configuration. Where's Windows installed (1st or 2nd HDD)? Most helpful would be the output of fdisk -l, your menu.lst and grub.conf.

And tell us if it ever worked- if it stopped working after you changed something---etc.

Linux and windows are on the same HD, just different partitions. I think that it stopped working because I deleted an empty partition that was before the windows one.

And abisko, where do I find those things you mentioned (menu, fdisk, etc)

fdisk -l is a command that has to run with root permissions.
The location of menu.lst may depend on your distribution. Have a look in /boot/grub.
For grub.conf look in the same directory or /etc.

Most probably the partition number has changed. Once you locate menu.lst, you'll find that the partitions are addressed something like (hdx,y). x addresses the drive. hd0 is the first drive on the controller. y points to the partition. If you previously had 3 partitions (Linux, something, Windows), Windows would be on hd0,2. After deleting partition "something", Windows would change to hd0,1. Change this parameter below "title windows" accordingly. You need root permissions to be able to save the changes.

Open a terminal and do this:
To edit the grub config file:
GRUB manual here

Results of fdisk:

Disk /dev/sda: 80.0 GB, 80000000000 bytes
255 heads, 63 sectors/track, 9726 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda2 * 9 9267 74372917+ 7 HPFS/NTFS
/dev/sda3 9269 9725 3670852+ 83 Linux
/dev/sda4 9726 9726 8032+ 82 Linux swap / Solaris

This is what my windows part on the menu.lst file looks like:

title Windows NT/2000/XP (loader)
root (hd0,1)
savedefault
makeactive
chainloader +1
boot

And can someone with windows post what their menu.lst file (or similar) looks like?

My Pc came with a small hidden partition before the main Windows XP parition. This is apparently used for restoring Windows. Some Linux distributions would try and set this first partition sda1/hd0,0 as the Windows partition and the boot into Windows failed because what I needed was sda2/hd0,1. When I first installed Linux I made the mistake of thinking that my Windows installation had been trashed. I wonder whether this 'empty first partition' was important to your Windows boot.

Maybe... But why would it? Its not really related to the window boot is it?

It's probably a vendor recovery partition.

I also wonder if the lack of an sda1 on your system is causing confusion. What happens if you try hd0,0 instaed of hd0,1

My menu.1st is below

As suggested, use "(hd0,0)"

I tried that and it said it wasn't there. I'll just check my partitions again and post if there is an update or something I haven't noticed before.

Any help..?