Perhaps it's because you have too much running on your machine? Your computer can only handle so much and, depending on what machine you have and such, it could be that it just cannot handle running Windows Media Player and RYL at the same time.
RYL is a lot more advanced now and there's many more fancy buttons and gadgets to use so perhaps you want to see about monitoring the number of programmes you have running at the same time - also, remember that usually your computer has programmes running in the background as well. I know my anti-virus software scans my computer every time it's turned on, and that can slow things down a bit if I'm trying to do a lot at the same time but, generally, I can have tons of windows and programmes running without it causing a problem with any of them. I regularly have iTunes on whilst being on RYL and loading pages on my browser and such has never interrupted it in the slightest.
|