See this link:
http://www.getfaxing.com/cgi-bin/ib315/ikonboard.cgi?act=ST;f=17;t=412
alternatively, you could simply click “Next” on that screen where it is hanging. Make sure you don’t tab over or click the CSID field. This will allow you to finish the install properly but will NOT fix the problem.
See link above to actually fix the problem with the CSID and Fax Number entry in WinFax when using Windows XP SP2
