You may not get much help because it is against Microsoft's EULA to run Vista Home (premium or basic) in a VM.
As for your slowness, how much memory does your MBP have? If it only has 2 GB w/ 1 GB to the VM, I'd suggest closing more apps on OSX or going to Fusion's preferences and change the memory performance preference to OSX instead of VM. I've noticed that helps my Vista VMs a lot.
Thanks for the answer. As far as I know and red in different locations, this is different in germany - according to the law here, this restriction is not applying. Anyway - the VM was activated w/o problems.
I shall try your suggestions. Thanks again.