Hi,
Most of the core programs require the kernel-source files to be installed. Suprisingle Mandrake has not been providing this with the download ISO images. Sometimes users have reported to have found the file in the CD3. It is called kernel-source-2.someversion
If you need the file you can download it by clicking this link
http://www.sunsite.org.uk/sites/carr...-7mdk.i586.rpm
If you are not able to download from this link then you can go into any other sitre listed under the download sites and look for the path 10.0/i586/Mandrake/RPMS where you will find the kernel source 2.4 and 2.6 Since you are using the MDK 10.0 I will advise you to download and install 2.6 which comes with MDK 10.0
Now log into console as root and excute this file with rpm and then try installing alsa.
bye,
Dino.