What specifically are the advantages of Mac over PC?

There are some advantages of a Mac
One of the major being there are hardly any viruses at all the effect them cause almost noone writes them for Mac...

An easy-to-use DVD to iPhone software which enables you to convert DVD to MP4, H.264, MP3, AAC, WAV and M4A which can be played freely and perfectly on your iPhone.

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Also you can run virtual PC which allows you to run windows/windows required products which sadly the Mac tends to run more stable than a PC does.
The main advantages of a PC is you can more easily obtain one (that is price wise) and you typically dont have to worry about compatablity like on a Mac.
In the end though... unless you are doing things that take a true demand on your comp, then PC is fine (art rendering... Video/Music editing... just for afew examples)
Why are you using RealPlayer to play a DVD? Open DVD Player instead.
Someone made a weird DVD. If this is a commercially made DVD, it would only play one audio track at a time. I have never in my life come across a DVD that plays two language tracks at the same time, and I own more than 200 DVD movies. When DVD Player first opens the disc, you should see a menu. Choose "Setup" or similar phrasing. Choose the audio track that you want to hear. Choose the subtitles track that you want to see (or "off" if you don't want to see the subtitles).
Some movies have a hard burned subtitle track that you can't turn off (like credits), such as many Indian movies. Most Indian people speak English as well as their regional language. You can usually also choose the "soft" subtitle track, such as French, Chinese, or whatever. In that case, you would see two written languages at times.
Technically, matching salaries only come into play when teams are over the salary cap. Teams that are under the cap have a lot more freedom when it comes to making trades and signing players. Since just about every team in the NBA is over the cap, this rarely happens.
Over the cap, teams have to match up salaries when they make a trade. The match doesn't have to be exact, but the salaries do have to be within a certain percentage of each other. If a team wanted to trade for T-Mac, they'd have to offer up at least $18,300,000 worth of salaries in return. (If I did my math right)