Didnt find such a tutorial if I installed windows 7 on a partition of my vista or xp and then removing vista or xp if I decided to keep windows 7 permanently.
by trial an error I managed to get it done with the following steps. if you are unsure, do a full PC backup first before you attempt...
active partition
backup
boot record
cloning
computer help
disk management
dual boot
norton
operating system
partition management
partition wizard
recovery
remove vista
remove xp
tech support
tutorial
unallocated space
windows 7
windows installation