How to DeleteFedora 16 and Ubuntu partitions?

[CommanderShawnzer]

I have Fedora 16 and Ubuntu 12.04 on my PC as multi-boot,trouble is i am running low on space and would like to delete the partitions containing Fed/Ubu so that the combined free space is added to my main C: HDD.i expect around 80GB to be freed.
Please guide me on how to do this
PS: I want to keep GRUB

 

[skeletor]

The grub which you are using is gets its configuration file from which OS?

Fedora or Ubuntu?

if you have Ubuntu live USB/DVD, boot through it - "Try Ubuntu without installing". Then open gparted and delete any one OS. If you are using Ubuntu's grub, then delete Ubuntu's partition. If you are using Fedora's grub, then delete Fedora's partition.

If you'll delete both the partitions, then grub will report an error in the beginning and you'll have to repair your MBR using Windows 7's DVD.