It appears that your notebook is trying to boot off a remote agent using the onboard NIC. What that means is the PC cannot find a boot partition on the floppy disk, hard drive or a CD ROM to load the operating system.
You should first make the settings change in your system's BIOS to disable boot options other than floppy, CD or HardDrive. You should consult your system documentation or visit the Toshiba or Intel support site to find the best way to do this.
When checking the boot sequence, set CD ahead of HD for the next step.
If you are sure that no changes were made to the system prior to this situation starting to occur, or if you find that the boot sequence already has the PXE option set to last, the cause is probably a little darker.
I know this is probably not what you want to hear, but... one of the most common issues involving notebooks/laptops is Hard Drive failure. So, the next thing to check is the drive.
assuming your are using XP (let me know otherwise)...
Using your XP install CD, access the Recovery Console command prompt. Here's a MS article that will guide you through the steps: http://support.microsoft.com/kb/314058 .
You can use any XP full install or XP upgrade CD to access the Recovery Console.
Insert a XP CD and boot up.
When asked, boot to the CD by hitting the Enter key.
After a short while, a menu will appear.
Select R for repair.
Next, you will be asked which Windows installation to use. Hit the 1 key on your keyboard and then Enter.
You may be asked for an administrator password. At which point you will need to enter it or hit Enter if their is none.
At the resulting C:\Windows> prompt in the recovery console , type 'chkdsk /r' (with a space after chkdsk and without the quotes) and hit Enter.
This will start the scan and sector recovery.
Leave the notebook plugged in and undisturbed until completed. Be aware that this process will most likely take several hours to complete (sometimes overnight).
When it is done, you'll know if it is a HD failure issue or not.
If errors were found, run it again.
(chkdsk /r)
If errors were found on the volume and Chkdsk was unable to recover or repair them or if Chkdsk was unable to run at all, you will need to replace the HD.
If you do not have an external backup available, you will need to install XP and your other software on the new formatted HD.
Based on your post, it sounds like you may have to reinstall regardless.
To close the Recovery Console and reboot, type EXIT and hit Enter.
Here is another good reference for using the Recovery Console: http://www.geocities.com/kilian0072002/recconsole2.html .
Please let me know the outcome.