1. Bitlocker Option available Windows XP has . No Bitlocker option
- Bitlocker drive encryption,
Bitlocker on volume
Prevents hard drive from hackers

2. Windows Vista has Windows Defender tool Windows XP has No Windows Defender tool available
- prevents from spyware&unwanted
S/W installing on computer

3. Windows Vista has Parental control Feature Windows XP has No Parental control Feature
- This option enables parents to restrict
Childrenâ€@trade;s which sites, games .software
to use&not

You can find a full list here.