Hello,
Thank you for contacting Steam Support.
The issue which was causing users to be unable to play Steam purchases of Command & Conquer: Red Alert 3 online should now be resolved.
If you are still experiencing this problem, please take the following steps:
-If you are running in Windows Vista or Windows 7, please completely exit Steam, and right-click on the shortcut which you use to launch Steam and select "Run as Administrator."
-If you are running in Windows XP, take the following steps:
1) Exit Steam.
2) Go to the "Start" menu, select "Run", type "regedit" and click "OK".
3) Navigate to the following registry key: HKEY_CURRENT_USER\SOFTWARE\VALVE
4) Right click and select "Permissions"
5) Check the boxes for "Admin" and "System" to "Full control" and "Read".
Please verify the GCF for this game:
Title: Verifying Game Cache Files (GCF)
Link:
http://support.steampowered.com/kb_a...2037-QEUH-3335
If you have any further questions, or this message did not pertain to your issue, please update your ticket and we will be happy to assist you further.