No kde in session options in login window; using twm
I'm using Fedora 8.
I'm still kind of a newbie, so I tried to uninstall packages from kde I thought weren't useful. By doing so, and because of dependencies, I must also have uninstalled important packages because while still using kde I had less programs in the main menu (alt + f1), and i couldn't even start the konsole (a message told me something like it didn't exist). I also noticed that in the package manager the option kde was unchecked, as if wasn't installed at all.
After restarting my computer, i got the login window and after typing my username and password, I didn't get into kde (as usual), but only to Twm (which was a windows manager, as I've just found out). Using Twm I have access to the Konsole and to firefox. I restarted my pc to see if could change to kde in the login window (option session) but I don't see kde (nor gnome because it wasn't installed). I only see default session and last session, any of which uses twm.
Using twm, I've already done "yum groupinstall (kdm desktop environment)"; the installation was successful, but I still don't see kde in the login window.
I've tried startkde and swtichdesktop in Twm, but i get "command not found".
What can I do?
Thanks for your help.