Can’t fdisk, please help

Long story made short…a friend was given a pc wit a lot of junk on it. She brought it over for me to reformat. I think fdisk and format, right? Wrong! I got a message to change the stacks in config.sys and then it gave me the fdisk screen. I deleted the partition, restarted w/out CD assist, and when you type in a command now. it just sits there and does nothing. PLEASE HELP!!!
Tracey
A+, MCP