A very important feature of MS Windows XP is the ability to start a defrag. This means that all boot files are located side by side in order on your hard drive. During boot XP can access these files quickly and gives a faster start. By default this option is enabled, but some users who upgraded from previous versions of Windows reported that it is disabled.
To enable Boot Defragment:
1. click Start- Run
2. type "regedit" and press ENTER
3. Go to HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Dfrg \ BootOptimizeFunction
4. Double-click on the right allows
5. Type "Y" in the value data field
6. Restart the computer.