Half-Life rip off

[SSJ3_ST]

Me again with EVEN MORE TROUBLE lol.... I think i have bin ripped off.. i put my code into steam and it is invalid :\ ????? can any1 help...

either a way around it or an idea

 

[Ravendust]

You wouldn't get an invalid code with a legit key. Did you buy it second hand? Off eBay? Bargin bin? Keygen?

Alternatively you can buy Half-Life through your Steam account, which'll deal with authorisation automatically.