How can I reformat my Dell Inspiron 600m and wipe it clean without any cds?

I have an old Dell laptop that is loaded with viruses! I need to wipe it clean..how can I do that?How can I reformat my Dell Inspiron 600m and wipe it clean without any cds?only way i know is with cd or floppy disk. killdisk is free, or take it to a local tech. some have a restore in a paration.How can I reformat my Dell Inspiron 600m and wipe it clean without any cds?hold control and F11 when you turn it on. You might have to try it a few times and it should bring up the option to do a system recovery. This is going to delete all your stuff so back it up. If that doesn't work you prolly need the CD's how ever most Dell's made after 2005 have this feature.