If you got everything working then cool, but I had somewhat the same issue were I wanted to remove windows vista boot loader since just deleting the partition still kept the boot loader. I removed it with this program I found on the internet you could even remove it within the OS. It was quite easy to use, just open the tool and it will find the boot loader, and just tell it to delete it.

If you still want it I can find that tool again.



About upgrading the graphics cards

From looking at your PC on the interrr-net, I found that this is a notebook? If this is correct then, no you can not upgrade a graphics cards on a notebook...well you can but you would need to replace the motherboard.