Ok we have to take a few steps back, cause you're skipping steps.
I suppose that's unnecessary in my case, right?
This step was necessary in your case, and I was trying to tell you that if the first commands for apt-get did not work,
you may have to use the commands with the actual rpm names. Then what you quoted was the actual names that I gave you to try.
Also you more than likely have the 3DDesktop package installed. You will need to start by following these steps, step by step.
First again, go back to the command line, and make sure you have an internet connection with ifup eth0, or whatever is needed for your ethernet card.
Then let's try to remove the 3ddesktop package
apt-get remove task-3ddesktop-2007-3pclos2007.noarch.rpm
Now if this does not work, we just need to stop and figure out why. Make sure the package is the one installed on the system, make sure the command was entered right.
Then install the kernel source, now I believe from earlier posts we need to try and get you sound working so we are going with the latest build of the kernel. So install by doing this
apt-get install kernel-source-184.108.40.206.granular2-1-1granular2008.i686.rpm
Now if this does not work, it's possible that you don't have that repo selected, and we would need to edit your sources.list file for apt, in order for it to see the repo.
Now I believe we removed the ati stuff, but if you have not then do so again.
Then try to install the dkms-ati package. You don't need to know how to do the dkms build, because if you install the rpm it will do it all for you. So try this
apt-get install dkms-ati-8.40.4-2pclos2007.i586.rpm
And if that does not work, we would just need to check the rpm name, and make sure it has not been updated. And if apt tells you, that you need to install ati first then do
apt-get install ati-8.40.4-2pclos2007.i586.rpm
And hopefully that will get you to a graphic interface. Understanding that these are not the drivers you desire, but we are going to have to focus on one thing at a time. Once we get you into that gui, we can then work on installing the drivers you're looking for.
Now last but not least. I honestly believe you have kinda mucked up this system pretty badly. And Aqua has given some pretty good advice, and that is to reinstall Granular. And there is nothing wrong with that, I am sure any of the other developers here will tell you. I completely hose my system beyond repair on a regular basis. And the thing is, if we manage to get you gui back, it may not have been worth the time. Because you can install the system very quickly, and we could move on from there. To figure out what drivers you want to go with, or what you are actually trying to accomplish. So I would honestly give this one more try, and if above stuff does not work, I would just reinstall. Then come back to the drivers. If it does work, we will end up at that point anyway. And would be right back to the gui. Unless there is some other reason you don't want to go with reinstalling. And if that's truly the case, we can try to dig deeper.