take the floppy out of the a: drive
ok...so the prompt is "c Doskey" or something similar? can you do any dos commands? maybe in the autoexec.bat a "prompt" command is setup to "doskey" (type "prompt $p$g" to set it back to normal if you care...)
seems like it's not loading windows, and dropping you into the dos prompt. can you change directories to the windows directory (cd \windows)? has it been wiped out maybe?
do a 'chkdsk' and see if there is are hard drive errors...
no error messages at during booting? xxxx not found, etc?