Powerpack 64 is the 64 bit version? You shouldn't install a 64 bit operating system on a machine which has 4GB of RAM or less; it'll just be slow and bloated and you only gain something out of 64 bit systems if you have a lot of RAM. If your CPU is 32 bit - it wouldn't even work either. Just stick to 32 bit.
Sorry that I couldn't help you "fast" as you requested - but this is a forum, and forums are like that
. Mandriva should be offering professional support for their Powerpacks since the Powerpack is a commercial product, so maybe they can help you faster next time (although I seriously doubt