How to logon in windows xp

Hello,

By mistake i have disable my administrator & user accounts.

After switch-on my PC next time, I got windows welcome screen and message that to start click on your user name; but there was no user name is available. One and only onw option is there turn of computer. So that I am unable to logon in windows xp.

By pressing CTRL+ALT+DEL+DEL key; I have got logon screen but I am not able to logon till now.

I got message "your Account is disable, please see system administrator".

But without logon to windows xp I am unable to see system administrtor.

Please suggest me how to enable my administrator & user Acconts so that I can logon to windows XP.

Waiting for your reply,

Thanks & regards.

Raj