Flashing a BIOS is extremely dangerous, only do it if you REALLY need to, you could lose your motherboard if something happens in the middle of flashing.
Yes you need an operating system, some motherboard manufacturers make their flashing utilities available for other OSs but most only make a...
I had this problem on my old computer that i upgraded to vista... It just means your computer isn't powerful enough to do what WMP wants it to do in a reasonable amount of time. Either upgrade your computer or get a less memory intensive program like winamp or media monkey
If you don't use it, you could turn your bluetooth off. Its in the settings of your phone. I personally always have my bluetooth disabled when i'm not using it.