Argh, I hate computers. After battling a problem with my Vista laptop, wherein it wouldn't play some MP4 files but would others (all using Quicktime Player), it turned out that the problem was an obscure incompatibility between Quicktime and Vista's ReadyBoost system (adding USB stick memory to cache system files).
Go figure. Who on earth could have connected those two?? I've been eyeing up a Mac for ages..... but hang on, it was Apple who wrote Quicktime Player, so they're not exonerated here either.
So I tried installing Ubunto Linux on a spare laptop, to have a play. Five HOURS later and the thing still wasn't even installed. I gave up. 8-(
Why do computers have to be so complicated and erratic?