If all you want to do is update your firmware to the latest version, there's little risk in downloading the appropriate file from the link above, unzipping it and running the flash tool. Make sure there's no disc inside and you select the correct drive, should you have more than one in your PC.
If on the other hand you're considering "crossflashing" to Lite-On firmware, I suggest you use Search and read the FAQ's and stickies in this forum extensively. It's all been written down before. That's how I learned anyway.