I have been doing a lot of searching and found this that kind of helped. It fixed Zero Hour but oddly not Generals.
"Here's a solution anyway (special thanks to lajakl):
1) Open the Registry Editor by typing "regedit" at the bottom of the start menu, in the search box ( windows 7)
2) Once you have opened the Registry Editor, go to this path:
HKEY_LOCAL_MACHINE -> SOFTWARE -> Wow6432Node -> Electronic Arts -> EA Games -> Command and Conquer Generals Zero Hour -> ergc
Click on the arrows next to the folder icons to navigate to the path
3) You should see your serial number in ergc set as something like HGUTJGIDBRY286HG92JG
Now:
- Check if this matches with the serial code your game came with
- make sure there are no spaces
To modify the serial number, right click on "Default" under "Name" and select modify."
i just cannot regsist . when i go to online icon and then he check for update . i donot know how to regist
