try
fdisk /mbr (for the HD you have decided to wipe out and have
mandy on)
then boot from the CD (are you sure you have set the bios to boot
from the cd, just checking, sorry to ask if you have)
There are lots of post about grub error 22
BTW if you do not need to post twice in a row, you can just edit
your post
Repost only if really needed, or leaving a good time lap
Think about updating your LQ profile
Let us know how it is going
see
http://www.linuxquestions.org/questions/history/364937
Oh yes you want ext3
and once mandriva cd/dvd boot up you will have
a menu to create as many partition as you want
and to format them
no worries, it is all graphical