Did you try recovering the account or contacting steam support about it? At least if you fşnd out why it "died" you can go about recovering it :) Cheers!

This is the source version, made out with HL2 engine, rather than HL1. In my opinion, nothing beats the classic Counter-Strike 1.6, the "regular" as you say, but, for new-comers who are not so familiarized with the essence of CS, usually they like CS:S better.