using Windows XP Pro, no username or password, Cannot remotely sign in to Windows

using Windows XP Pro, no username or password, Cannot remotely sign in to Windows

I can get my PC screen to come up on my Android device (HTC EVO) but can not logon to Windows through my Android device. When I try to sign in to Windows XP Pro through my Android device I get " LOGON MESSAGE: The System could not log you on. Make sure your User name and domain are correct, then type your passowrd again. Letters in passworeds must be typed using the correct case."

When I log on on my PC directly I leave User name and Password blank and never have this issue.