Grub, MBR, Swap and Error

["Bobex Scores" <bobex.fedora@xxxxxxxxx>]

I'm using FC6, Ubuntu6.10 and Slack11. and I install slack the last. 
After I install slack i dont like lilo, so i want to go back to FC6 
Grub, I insert FC6 DVD installer and type "linux rescue" and in konsole 
I do :
# grub
  grub> root (hd0,1)       
  
grub> setup (hd0)

and I restart, yes it worked, but after 6 hours, i restart my computer 
and it say grub hardisk error, so i heve to do that step again, and it 
works again, and error again after restar.
I tried with ubuntu cd installer, I pick star ubuntu safe graphical 
mode, and in terminal i did step above but with "root (hd0,5), and it 
worked just fine, not like fedora, how could it be? am i dong something 
wrong?

After I boot to fedora with grub from ubuntu, i get the message :
" unable to access resume device in LABEL=SWAP-hda5 "
I figure that this error because I install slackware, and slackware 
change the swap prperties, so FC6 can read it. before I install 
slackware in /dev/disk/by-label , I found "SWAP-hda5" and i got no eror 
message like that, but after i install slack the "SWAP-hda5" is gone, so 
that's why i think FC6 got confused. how could i bring back that label 
to my swap partition so the error is fixed. I know this error is not 
big, without that swap i still cant run my FC smoothly, but it's just 
annoying. thanks.

any help?