GRUB Reinstall (Separate issue from recent issue with same subject)

[Matthew S-H]

I recently fubared my system.  (by the way, "fubar" is a word that  
means seriously f---ed up. -- different from the common foo-bar).
I have 2 harddrives:
40GB Maxtor
120GB Western Digital

The 120GB drive contains 2 partitions and some unallocated space.   
Both partitions are used by Windows (one for system, the other for  
data).
The 80GB drive contains:
     1 extended partition with a number of partitions dedicated to  
linux ane some unallocated space at the end
     1 primary partition with some old backups of some files on my  
laptop
     A fair amount of unallocated space.


Anyway, I was stuck using Windows for a few days (only like 4).
[RANT]
I didn't have the charger for my laptop (which runs MacOS X 10.4.1)  
and I needed to run some proprietary software that is Mac/Win only.   
So, I booted into the XP partition I hadn't touched in about a year  
since I started using Ubuntu.
BIG NIGHTMARE!!  Everything needed to be updated, the thing got a  
virus within minutes of signing online, it was slow as h---, and it  
seemed to have an odd problem with memory that it never had before.
[/RANT]
Anyway, a little bit of thinking gave me the bold idea to create a  
separate partition on my 120GB hard drive that was dedicated for a  
Windows paging file.
I thus created a new partition at the end of the 120GB hard drive and  
let Windows create a paging file there.  I then rebooted because  
Windows told me to.  A minute and a half later (Windows took a  
while), I was staring at the 9 words:
GRUB Loading stage1.5.
GRUB loading, please wait...
Error 15

Anyway, after that long story, anyone know what I can do to fix it?
I have most of the directories on my Ubuntu system on their own  
partition.
Here are the 3 that are probably most relevant:
hdb5     /
hdb6     /boot
hdb10    /home

Again, any advice would be greatly appreciated.  Either a walkthrough  
or a link to one would be nice.



~Matt
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