master boot record

[Paul Runner]

 I am new to Kubuntu and linux, I would like to know how to delete previous versions on the master boot record. Everytime I do an update it adds the new version and the older versions stay as a choice.  Also other family members use the computer and I would like to make Wndows  XP the default startup OS or have a longer time before Kubuntu is automatically chosen.
   
  Thank You,
  Paul
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