I was able to succesfully install viewnx on my desktop. I use window xp pro and did not need to uninstall my hp (deskjet 670c) software.
My problem actually lies when I try to use it this way - I have a main folder for my pictures (folder name My Pictures). In this main folder I have several subfolders - 2005, 2006, 2007. And in each of these subfolders are another set of subfolders. I use the date of the shoot as the folder name eg. 071115 (to represent the date of the shoot)...
On the directory tree, when I click on My Pictures folder, the program crashes. However if i click on the "+" sign to expand the folders, and go directly into the subfolder, say the 071115 folder, it works fine...