I'd try to install again with all the disks then. There is a very high chance that you needed software off of the other 3 disks in order to complete it correctly.
Now if it just wanted to test the media, that's ok, you can usually skip that if your 100% sure of your disks, but when performing a install of mandrake it's important to have all your disks you need. If it asks for disk 2 during a install because it needs to copy files you need to have it otherwise you won't have everything you need.
Are you familar with bittorrent?
here is some mandrake bittorrents
That is for the official 3 cdrom images of mandrake 10.1
They also have a single disk DVD version. Bittorrent is usually faster then a straight download, but you kindof have to know how to use it correctly to get the higher speeds.
Otherwise there are mirrors and such
here if you can find a mirror close to you often the speed will be faster then if you downloaded it from the main site.
For the log file you can mount a MDOS-style-formatted floppy disk and copy the log file to the floppy and then read it in Windows.
mkdir /mnt/floppy
(if it didn't already exist)
mount /dev/fd0 /mnt/floppy
cp /var/log/Xorg.0.log /mnt/floppy
umount /mnt/floppy