When I try to run any Lite-C program, I get the following error message:

Error E1242: Can't open video device. Try -W3D command line option.

Adding the -W3D command line option has no effect. Any suggestions will be appreciated.

http://manual.conitec.net/engineerrors.htm

Is it that what you were looking for?

Error E1242: Can't open video device

E1242 is issued when the D3D device can be opened, but a video device is not available for the given resolution. The engine tries some lower and higher resolutions before giving up. You need a 3D video card for running DirectX applications. Further possible reasons are installation of a wrong video driver, or an extremely high nexus setting (above 500 MB) that consumed all the virtual memory.

It looks as though there may be a problem with either the video driver or DirectX. Thanks!