I have not been able to get Sins to launch since I bought it on Steam. I have tried running it from every different location, using normal mode, Administrator mode, and XP mode. I have deleted my local files through Steam and re-installed. I have rebooted repeatedly. Nothing seems to matter.
I have a Dell XPS 1645 w/720QM and 6GB, running Win7/64 Professional. I should have more than enough machine; indeed, some time back I installed and ran the Sins demo for several weeks with no problems.
When I launch the game, from any source (including Steam), the same thing happens: I get the "working" cursor for 2-4 seconds, after which the computer seems to "forget" that it was trying to do something in the first place. No new tasks ever appear within Task Manager at any point in the process.
I am growing very frustrated with the whole process. I was really looking forward to finally playing Sins over the holiday.