Try
Irfanview Viewer its a great program!
One of the mnost popular around.
Keep in mind that a TIFF file is a completely uncompressed format of an image. Very high quality, but also very large file sizes.
Internet Explorer is very unstable, and opening large TIFF files may cause it trouble. If you can, try right clicking on links and 'save target as' and then save those TIFF files to your harddrive, and open them with one of the above mentioned programs. Or be patient with your internet explorer, it will probably open them eventually, but if you start clicking away at things, it will likely crash.