can i start a new windows os in comand promt?

[tylerisdabest]

just like the topic but its the same xp im using

if can tell how

[Dusty]

I do this by using batch scripts when swapping between OS's or simply rebooting into Safe Mode or the Recovery Console or the same OS with different options:

1.  Rewrite boot.ini to load a different OS by default (or the same OS with different options)
2.  Use the Shutdown command with the -R option
3.  Again rewrite boot.ini to return to the original OS/settings

Care is required.

Edit:  I just realised that you might mean how can you restart Win XP from the command line, use the shutdown -r command at the Command Prompt.