Red Alert 3 - Serial number is invalid.

I get the same error, followed the indtrustions:

1. Open your Registry Editor - You can do this simply by pressing the start button, type "regedit" and press enter
2. Navigate through NKEY_LOCAL_MACHINE / SOFTWARE / Wow6432Node / Electronic Arts / Electronic Arts
3. There should be a Red Alert 3 folder in there with a subfolder called ergc - Go into that folder - Attention, there also is a red alert 3 folder under just once Electronic Arts instead of Electronic Arts / Electronic Arts. This folder will not have a subfolder!
4. The ergc folder should contain a (Default) value of the type REG_SZ with the DATA of your serial key without any - between the blocks
5. If that's not the case, right click, new / string value, enter as name (Default) and as data your serial code without any - or space.

my serial no, was CORRECT, I entered it again anyway, still correct, stil DOES NOT WORK...

Please ADVISE asap what to do now??