Autorun.inf is a small file that dictates what program should be launched and what icon should be displayed in My Computer in Windows when a CD or DVD is inserted.
To run the the program LPC
Scan your computer with anti virus software, if you don't have any download some (I recomend AVG free edition).
There are many ways to do so. The easiest way but not aways free is to search on google for "Autoplay Creator"
The autorun.inf file is not crucial to the installation process; it only brings up the setup program automatically when you insert the disk. You can still perform an upgrade by running the setup program manually, or perform a clean install by booting from the CD. Note that a Windows XP disc missing this file is highly unusual, and if this file is missing, it is quite likely other contents may missing, damaged, or have been tampered with.