Hi!

I'm having a problem with Steam and Half-Life. Long ago, I had registered my game on Steam. I then thought it sucked and deleted. After a while, I give it another shot, but I've forgotten my e-mail or password(cannot remember which) so I re-registered my game CD-key. Everything was ok, I got it working and played a couple of days. I do, got a message from Steam:

Dear Steam user,

This is an automated message generated by Steam account administration.

Steam has detected that your copy of Half-Life Platinum Pack has already been registered to another Steam user. Your product's CD-Key (the number printed on the CD case which you were asked to type in after installing the game) matches one already in our database.

The CD-Key you entered is: xxxxxxxxxxxxxxxxxxxxxxxxxxxx
You will not be able to play Half-Life Platinum Pack unless you provide an unclaimed CD-Key. To provide an unclaimed CD-Key, you will need a copy of Half-Life Platinum Pack which has not already been registered on Steam. Double-click on the name of the game in Steam's "Games" window and then follow the given instructions.

For further help or product support, please visit http://www.steampowered.com

But I could keep playing anyway. Today, months later, I reinstalled Steam and tried to play Counter-Strike. Since I remembered (and this time wrote down) my login (the second registered) everything went smooth, until I was asked for the CD-key:

blabla bla registering CD key through Steam:
#######################
Unable to register your CD-key. It's matches one already in use in our database...

So, how would I fix it? The forum is useless and many are having the same problem. Their support is lame, I've never got an answer....
It's unfair to do not be able to play a game that I've paid for and own legally, just because they made everything so difficult for the player. A player wants to only put the CD on the drive and fire up the game, not register this, write down this in a note pad, download 807 megas again....
Is there anything I can do? I won't buy another copy of Half-Life because, above all, I own that game and I HATE HALF-LIFE... it's very stupied to buy a game that I hate twice. It's like to have my worst nightmare and be charged for it, again...

Thanks

I've managed to fix it. After a long time spent with their support forum, I've got an e-mail where a guy takes care of the serial numbers and fixed this for me.
Well, after install Counter-Strike, and download more 3 or 4 anti-cheat programs required to play the game in some servers, I was set. Problem is... there's still peoples cheating... Same old game, very same cheaters, very buggy as well...
Conclusion: I've uninstalled it again... let's see in a few months how this will be