Episodes 1 and 2 are "standalone" expansions to hl2. and you should be able to play HL2 on your computer since mine played it with only minor slowdown sometimes (specs: AMD Sempron 2800+, 512mb of ram and a Nvidia GF FX5200). i can't answer the other questions since i don't have steam installed (Piece of sh**) and before you ask, i used a no-steam crack for hl2.
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