I don't know the procedure for your specific PC but usually you put the CD in right
at the beginning and the PC boots from the Restore Disk - it never goes near Windows,
so you don't have to logon.
No harm in trying this.
Do you have a manual ? If not they are usually available from the manufacturer's
website. If you can't find it there I expect someone here can help - might be worth
starting a new thread if that's the information you need.