The question really is "am I drawing more than 500W?". No, you are not so, your 500W AVR should be able to provide enough voltage to the PSU. Just a quick guesstimation puts your system draw at less than 300W. You should be fine with your current setup (I'm going to add here that a no name PSU that comes with a case probably isn't going to work real well over the long run), you may want to replace the PSU just on general principals.
Hope it helps
Thank you sir C12!, but I forgot to mention that I will plug in the AVR a Speaker (No Brand) and a 17" CRT Monitor which I found out to be around 90W. Also, I will be playing games like GTA IV, COD, NBA2k13, Far Cry 3, Some old and new games that my PC can possibly play. I will be playing them on settings that my PC can handle. So, will it still not reach more than 500W if given these conditions?
Answers would be appreciated! Thanks!