The first thing you want to do is create a new user that you can use when you log in remotely. I'll make it so that it doesn't show up on the windows XP Professional login screen, so you have to type it manually into the login box when you remotely connect.
Save this as a batch file:
net user remotelogin enter password here /addnet localgroup administrators remotelogin /add@echo offecho Windows Registry Editor Version 5.00>win.regecho [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList]>>win.regecho "remotelogin"=dword:00000000>>win.regREGEDIT /S win.REGDEL /Q win.REGmkdir %SystemDrive%\DOCUME~1\remoteloginattrib +a +s +h %SystemDrive%\DOCUME~1\remotelogin
, replacing enter password here with the desired password you wish to use with your remote user. You won't be able to remotely access your computer without it.
Now you must reboot to make your computer read the new user.