Hi all!
some years ago ive buyed hl, installed it and downloaded cs and installed that. It worked perfect! but now, ive buyed a new harddrive, ive got two computers and on this cs is installed and i want to get it installed on the other com. (I transfered it!) And of course it asked for a key, but my own is gone, so i used one there is invalid on the net, (it works only on LAN) and here (yesterday) ive found my key, but how do i change the key from the invalid to the other one???

some years ago ive buyed hl, installed it and downloaded cs and installed that. It worked perfect! but now, ive buyed a new harddrive, ive got two computers and on this cs is installed and i want to get it installed on the other com. (I transfered it!) And of course it asked for a key, but my own is gone, so i used one there is invalid on the net, (it works only on LAN) and here (yesterday) ive found my key, but how do i change the key from the invalid to the other one???