WebStorm generates a 404 error on an empty HTML5 file

So I have just downloaded WebStorm for my PC, and it generated a 404 on an otherwise working website. I tried running it on Sublime Text 3 and it worked, so the website it itself is fine. I then thought that something is wrong with the website itself, so I created a new file, named index.html using Sublime Text 3 but it still printed out the 404 error and when tried to run it using google chrome, bypassing webstorm, it showed me an empty file which was expected. I will say that I am using Windows XP. Why is it doing that? Also, where are the docs on this IDE? 

Edit: Sorry, cannot post the image due to the size being too large (the image is 3MB vs the allowed 2MB). I think that Webstorm's web server is giving me the problem. Because the URL itself is working perfectly but something like this pops up it is not working. Here the problem URL: http://localhost:63342/index.html/?_ijt=lolp00gelspdn9620js7nutuev. Her is the working URL: file:///C:/Documents%20and%20Settings/Administrator/Desktop/Computer%20Science%20ISU%20Websites/Second%20ISU%20website/index.html. Hope that helps!