How can i change my operating system from vista to xp i have a hardtime using vista?

You will need to have an XP software (system disk) to perform the full installation to your computer. It will be a lot of work if the hardware of your computer are newer than XP, but this is workable. Vista is not perfect or as smooth as current stage XP, but other than slower it is still usable or an Ok operating system. This is your call at the end...