Terminator Salvation was released today in North America and via Steam, but there seems to be install issues with the PC version purchased at retail outlets.
Over on the official Terminator forums, quite a few users are reporting an Installshield installation error with the majority unable to resolve the problem.
A workaround has been posted, and it appears to work for some, but others are still having issues.
No word yet if Steam users are having the same issues. We’ll keep you posted.