Hi,
Autodesk product support has a listing of raster conversion programs (see below). You could also try to "plot to jpg" if you have a raster file which is big enough and not to complicated (Not LT). If you have an LT, feel free to send me the file and I will try to help.
Draftsmanplus 313-741-8700
QuickTrace 212-6052339
Caddview 607-264-8149
CorelDraw CorelTrace 613-728-8200
EnvisionIT 800-444-4223
VPmaxNT 800-448-7629
HiJaakGraphicsSuiteVER3.0 203-740-2400
Regards,
Tom