Hi. When I try to launch SC2, I got the same error message, and followed the procedure.
My computer is on XP-family edition too.
I do have the DEP and I put the 3 files
SC2.exe, Editor.exe and runservice.exe in the "turn on DEP for all windows programs and services EXCEPT those I select" box. It didn't fix the problem.
When I right click on the SC2 short cut-> license details, I can see my license is here.
Any news to fix this problem ?
Should I run dxdiag and send it to you ?
Thank you for your help.