I played GE:S yesterday afternoon, changed the launch options to "-dxlevel 95 -console -heapsize 2097152 -high -novid -noforcemaccel -noforcemparms -w 1440 -l 900 -noborder -window" and it would not run. Removed the launch options and it still wouldn't run. Opened my task manager, went to the processes tab, and tried to open GE:S again. What I saw was hl2.exe popping up and then closing in the processes list. All other source games I have are working fine.
I have already tried disabling my firewall and running it, uninstalling and reinstalling, and I have run both SDK Base 2006 and 2007.