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WINDOWS cS1.3
1) Close Steam.
2) Download and run the installer.
3) Change the install directory to: C:\*\Steam\steamapps\*YOUR_ACCOUNT*\half-life
3a) If the "half-life" folder is not there, run Half-Life and enter any server, then exit the game and it should have automatically been created.
4) Once the install is done click the "Games" menu and under "3rd-Party Games" click "Counter-Strike".

LINUX CS1.3
1) rm cstrike
2) wget http://files.redphive.org/cs_13_full.tar.gz
3) tar -xvzf cs_13_full.tar.gz
4) This will extract it to /cstrike
5) mv cstrike cs13
6) cs cs13
7) Make sure to edit the server.cfg in the cs13 directory and mapcycle.txt
8) Start the game using:
./hlds_run -game cs13 +exec server.cfg +ip 10.10.10.10 +port 27015 +maxplayers 16 +map de_dust2

LINUX HLDS:
1) adduser hlds && passwd hlds
2) su hlds
3) cd ~
4) wget http://www.steampowered.com/download/hldsupdatetool.bin
5) chmod +x hldsupdatetool.bin && ./hldsupdatetool.bin
5a) If you see an error about not finding /bin/uncompress type ln -s /bin/gunzip /bin/uncompress && ./hldsupdatetool.bin
6) ./steam -command update -game game -dir ~/hlds -username yoursteamaccountgoeshere -password yourrealpasswordgoeshere
6a) Replace gamename above with cstrike for CS
7) The tool will probably update itself, and then begin downloading the files.