This is the reply I got from Steam. Seems like an automated reply, which is disappointing.
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A staff member has replied to your question:
Thank you for contacting Steam Support.
If you are currently running Vista or Windows 7, please complete the instructions in the following link:
Title: Windows 7 and Vista Troubleshooting
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 "Allow" boxes for "Admin" and "System" for both "Full control" and "Read".
The remaining steps apply to *all* versions of Windows.
Please also verify the GCF for this game as outlined here:
Title: Verifying Game Cache Files (GCF)
Note: Files may fail to verify. This is normal and can be ignored.
Then test the issue.
If you still have difficulty, you may also need to manually run secondary installers required by this game.
Exit Steam entirely.
Browse to your Tom Clancy's Ghost Recon Future Soldier installation folder (Usually C:\Program files\Steam\Steamapps\common\Tom Clancy's Ghost Recon Future Soldier\)
Run the following installers:
C:\Steam\steamapps\common\Tom Clancy's Ghost Recon Future Soldier\redist\vcredist_2008SP1_x86.exe
C:\Steam\steamapps\common\Tom Clancy's Ghost Recon Future Soldier\redist\DirectX\DXSETUP.exe
Reboot your computer and test the issue again.
If the issues persist, please complete these guides:
Title: This game is currently unavailable
Title: Games do not run after 'Preparing to Launch'
If you are still having difficulty after going through this process, please contact the support team for this title:
Title: Tom Clancy's Ghost Recon series
Where do I go from here?