is partition magic compatible with vista?
is there any other tools for partitioning which are compatible with vista?

What do you need to do with one? The reason I'm asking is Vista has its own Disk Management utility, which can resize NTFS partitions without losing data, create, delete and format new partitions.

well thanks , i did not know that!
where can it be found?
under system tools or control panel?

Control Panel -> Administrative Tools -> Disk Management.

Well, in classic control panel anyway.

i took a cursory glance at the programme but could not see an option
to re-partition an already existing drive with data on into two. can u help me out?

I'm not in front of my home computer but I found this easy to follow tutorial.