to get your CD4 sources back (or any CD source, for that matter) do the following..........
MCC->software management->software media manager. click on each CD source (one at a time) then click remove. when they're all removed, click the "add" button. click on "removable device". insert CD4 & mount if necessary, in the "name" box name it whatever you like (keeping it simple helps, IE: mdk cd1, mdk cd2, etc.). in the "path" box put /mnt/(name of cdrom that the cd is mounted in), IE: /mnt/cdrom, /mnt/cdrom1, /mnt/dvdrom, etc. leave the "relative path to synthesis/hdlist" box blank. click "ok". when it's done, remove the CD (umount first if necessary) & repeat the above procedure for each additional CD source if you have others. click "ok" when done.
for nvidia installation, see my post #2 in This Thread
as for your net speed issues, that could be caused by several things.......... heavy network traffic, too many internet connections at once, a slow site, a bad connection, etc. it's tough to troubleshoot something like that. i'd say try a few different update mirrors until you find one with decent speed. the speed of various ftp mirror sites can vary greatly.
if you want to eliminate some running services that you probably don't need, go to Mandrake Control Center->system->services. use the info buttons to see if you think you need something. chances are, you won't need most of them. i have mine whittled down to 17 running & i prolly could eliminated a couple more if it weren't for the convenience of it. (like numlock, sensors, harddrake, raw devices). just make sure you don't shut off some services that are absolutley needed for your system to run. the following are needed...........
alsa (if you're using the alsa sound system)
cups (if you want to print)
dm (for your graphical display)
iptables & shorewall (if you're running a firewall)
keytable (for keyboard)
kheader (kde kernel header regeneration)
network (for internet)
random (for security)
sound (self explanatory
xfs (X font server)