The simplest thing would be as suggested, set vista as the default operating system.
Did you already delete the Kubuntu/Ubuntu partitions?
If i format the ubuntu partitionand swap partition will the ubuntu boot loader still show.
Yes, if you were booting with Ubuntu Grub. You need to write vista to the mbr which is not on any partition to boot just from vista.
Why would you want to remove Kubuntu without formatting it? vista won't be able to use the Linux filesystem you have Kubuntu on.
I hope you have a Recovery or Installation disk. If you want vista in the master boot record, you would be best off using EasyBCD program from neosmart technologies. goog documentation and easy to use.