My install with XP and some other music programs uses about 100 gig. My songs stored on another drive are 40 gig. If it was me I put in the Linux live CD and fire up GParted and shirk the Kubuntu partition and then format the unallocated space as NTFS for use with Vista. Do not try and expand the Vista partition. It may not like it and really mess you up.
You could also just run it from the USB drive but first make a backup.


John
ESI Gigaport HD+
Lenovo Turion II /4 Gig Ram/ Win7x64 be
15.6" Monitor
"The only Band is a Real Band"
www.wintertexaninfo.com/BANDS/JohnnyD.php