Problems loading tiff images

Hi, I'm trying to load several tiff images in a .NET windows forms project, but when I use an Image object I get a "OutOfMemory" exception and when I try a Bitmap object I get a "Invalid argument" exception. The images are correct and I can see them using windows imaging. (The images are compressed tiff) Anyone knows another way to read those tiff images? I cannot convert them into other format because the images are provided by an external application. Thanks in advance