I am trying to install Windows XP Home onto my hard drive. It gives me the error "invalid system disk".

I went into MS dos last night a told it to format my hard drive. Today I am trying to do a new install of Windows XP Home and I get the message - "Invalid system disk". What do I do now? I tried to use the recovery disk from my computer to format and recover, but it does not finish. It just stops. Any advice?