[SOLVED] Deleting Windows7 and merging partitions with Ubuntu

Hi All,

My system is currently configured for dual-boot: Windows 7 and Ubuntu 13.10, via GRUB.
When I boot on Ubuntu I can see my "C, D, E and F" NTFS partitions and access my Win7 files. [each NTFS partition is displayed as separate drive in Ubuntu]
I almost always use Ubuntu Linux, and very rarely Windows 7.
Long story short, my Win7 is severely corrupted and unusable, and since now I'm very comfortable with Unity desktop and rarely boot to windows, I decided to completely make the switch and not re-install windows.

My question is:

How can I go about

- wiping my "c (NTFS) partition and assign it to Ubuntu's partition(s)?
- re-map my "D,E and F" NTFS widows partitions to my ext4 Ubuntu home folder? (without erasing anything - I have lots of documents, saved work and video files in these NTFS partitions)
- Remove the Windows7 dual-boot from GRUB and make it single-boot? (boot directly to Ubuntu without the "Windows 7" option).

Simply put, I wish to completely get rid of Win7 and give all HD space to Ubuntu.

Thanks for any suggestions.

Dimitri Papadopoulos