[quote name='Fatality']Could someone help me Railroad Tycoon II Platinum Edition on steam fails to run on my computer im running Windows 7 Home Premium 64 bit[/QUOTE]
I'd check the Steam forum for that particular title. You could also Google the issue and see what you come up with.
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As far as games disappearing from Steam, agreed! I wanted to get Sims Medieval and the expansion. It had been on sale a few times, but I was waiting for a drop. For whatever reason, the expansion is no longer available on Steam.

Sad. I think the game itself is, though.
Risen was on Steam, then disappeared, then came back, and I got a swinging deal on that one (although I forget the price). I go to Steam for all my gaming needs. If it's not on Steam, generally I won't play it at all. EA is making it hard for me, though, since they took Dragon Age 2 off, and I don't think Mass Effect 3 will ever be on Steam. Annoying. I'd really prefer to have nothing to do with Origin, but I might have no choice.