L300 series, what?
Contact the manufacturer of L300 series and buy a recovery disk. Are you trying to repair the operating system or do you need drivers?
You can also buy an XP disk on Amazon, ebay, etc....You can run the repair install without erasing your personal files, by following the directions posted in this forum, sixth post from the top.
If you have a student e mail address you can download from digital river, microsoft software for students, win 7 pro costs about $40 includes a backup disk.
you can take the drive out and install it as a second drive on a working computer, drag your files off the damaged drive, make a back up. Then re-install the bad drive, do a fresh install of the operating system.