?? The only IOS I know is an Apple operating system. Since this is a Windows XP forum, I don't understand. three questions. First, are you trying to do a complete OS install? If so, which OS? What OS is the machine currently running?
1) Contact Toshiba support. They can probably supply a recovery CD at the very least; maybe your machine came with a recovery partition and they can talk you through it.
2) If you have a bootable recovery CD, or a valid XP cd, there are ways to build a bootable pen driver but ONLY IF the pc supports booting from USB. heck, if it boots from USB, you could borrow a USB CD driver from someone.