Can they or have they installed Construct? Also make sure you run all parts of the installer: some people assume their DirectX is up to date because it is version 9.0c. That does not necessarily mean it is up to date; Microsoft release frequent updates, while keeping the version number at 9.0c. So a DirectX update is a must.
Also, I'm not sure, but I think someone else reported Data Execution Prevention (DEP) breaks Construct. Maybe turning it off if it's on will help.