Get yourself a copy of both of the following;
Gparted Live CD
PartedMagic Live CD
If you look at the following blog, you will notice that this is an error which is not unheard of (maybe a little less anxiety can be found in that);
However, that blogger's solution is probably beyond you... and you're going to need tools to do it that will make you more comfortable,... hence my download suggestions...
From the Live CDs, it should be possible to fix your grub error (SuSE 9.3 almost assured used Grub as opposed to Grub2). And, the Live CDs will likely let you do it with a graphical text editor... But having the Live CDs will help make sure that the error wasn't cause by another problem (physical problem like failing sectors, etc.).