I'm assuming you mean a floppy startup (DOS) disk.
Put a floppy in the disk drive
Open My Computer and right click on that drive
Select the Format menu option
Check the "create an MS-DOS startup disk"
Click the Start button
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.