Log in to your windows through one of the windows vista. Then delete the folder in which you have installed other windows. This way you will get rid of extra windows.
I Have 2 Window Vista On My Computer I Need To Delete One Of Them How?
Log on one vista, and go into the command prompt. Then type del c:\windows
Then press [y] and one operating system will have gone
Then press [y] and one operating system will have gone